## 2. PHYSICS

#### Subsections

- 2. physics - general
- 2.1 physics poetry
- 2.2 physics quotes
- 2.3 physics puns
- 2.4 pseudo physics (cat physics, cartoon physics)
- 2.5 new physical theories
- 2.6 learning physics
- 2.7 not learning physics (featuring Heavy Boots)
- 2.8 physical proofs
- 2.9 physical one-liners
- 2.10 quantum mechanics (starring Schroedingers cat!)
- 2.11 relativity
- 2.12 measure the height of a building with help of a barometer
- 2.13 physicists
- 2.14 astronomy
- 2.15 electrons
- 2.16 electro-magnetism and light
- 2.17 Newtons's laws and classical dynamics
- 2.18 thermodynamics
- 2.19 in the lab
- 2.20 strange but real findings
- 2.21 the buttered bread on cat problem

### 2.10 QUANTUM MECHANICS (STARRING SCHROEDINGERS CAT)

Index | Comments and Contributions | previous page

physics
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    Special Category: Definitions and terms
    From: Joe Fineman <jcf@TheWorld.com>
    "To understand something means to derive it from quantum mechanics,
    which nobody understands."
        -- Proverbial among physicists; don't know if the origin is known.

physics
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    From: Gary Edstrom <gedstrom@pacbell.net>
                         Wanted: Good home for abused cat.

    The Humane Society has placed up for adoption a lovable cat that was
    recently removed from the laboratory of a noted physicist.  The animal
    was abused repeatedly, having been exposed to poisonous gas and also
    being placed in close proximity to radio activity.  Cruel experiments
    like this can not be tolerated.  The owner has been charged with
    numerous counts of animal cruelty.  Dr. Schrodinger's cat is
    recovering nicely, however.

physics
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    From: "The Sophontologist" <sophontologist@look.ca>
    Mrs. Schroedinger to Mr. Schroedinger: What the hell did you do to the cat?
    It looks half dead!

physics
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    From: CroutonGuy <CroutonGuy@centuryinter.net>

If Schroedinger's Cat walks into a forest, and no one is around to observe it, is he really in the forest?

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    From: bijl@optica.tn.tudelft.nl (R.J. van der Bijl)

Two electrons are sitting on a bench in the park. Another electron comes walking by and says:"Hi there, can I come sit with you?", to which the electrons reply:"Don't be ridiculous, we aren't Bosons."

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    Sign on railroad station:
    These railroads are subject to Heisenberg's Uncertainty Principle: Position
    and Velocity of a given train can not be specified at the same time.
    -- Sydney Harris Cartoon

physics
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    Special Category: Werner Heisenberg
    I do not know what is wrong with Heisenberg.  He seems so sure of himself
    lately.
    -- Sydney Harris Cartoon

physics
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    From: alpham@icanect.net, Marc de Groot <marc@immersive.com>,

    Keith Bostic <bostic@bsdi.com>

    SCHRODINGER'S CAT BOX

    A fun project is the Schrodinger's Cat Box.  You need a mild source of
    radioactivity (I use scrapings from old "luminous" watches I get at flea
    markets).  I make a box out of plywood except that two sides are small
    celled Nomex honeycomb (<.125") cut to three inch thickness.  One honeycomb
    side is covered with onion skin paper and the other is left open.  A strong
    light is positioned outside the open celled honeycomb wall and is directed
    into the box.  The radioactive scrapings are smeared across the light lens
    with a bit of glue.  Inside the box I put the sensor to a Geiger counter
    (borrow one from your local high school).  The counter is connected to a
    fast relay which, when closed by an alpha particle from the scrapings,
    lights the light.  Now, a small, live animal (cat) is placed into the box.
    One stands behind the onion skin paper side of the box and plugs in the
    Geiger Counter.  With no light the alpha particles are few and are not
    sufficient to turn on the light.  The light is switched the first time with
    a switch which is in parallel with the relay.  Instantly you can see the
    shadow of the animal on the onion skin paper.  Then, as the cat moves, the
    light and rush of alpha particles turn the light on and off, strobe like,
    and you can see that sometimes the animal is not there, or some part of him
    is gone!  It's quantum uncertainty can be measured.  It proves that there
    are two states for the animal (and everything else) -- existence and
    non-existence.  No harm comes to the animal, by the way.

physics
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    From: Johan Blixt <blixt@trantor.math.kth.se>
    I found this in "The Guardian."  (UK)

    Disregarding the metaphysical aspects of Schrodinger's cats, (Letters,
    April 28) I must protest at the use of (possibly live) animals for
    experiments such as these.  I urge readers to boycott whatever product
    this research is leading to.

    Roger Bisby, Reigate, Surrey.

    [Note - originally appeared in RHF during second quarter of 1990 - ed]

physics
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    From: "Anthony Coulter" <c17gmaster@earthlink.net>
    There is nothing wrong with the Schroedinger's Cat experiment! You aren't
    actually killing the cat until you measure it... When the Humane Society
    comes up and looks into your box, you can rest assured that the cat's death
    is their fault...

physics
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    From: kim@shell.portal.com (Kim DeVaughn)

    "Quantum mechanics, hmmm.  You put a cat in a box, along with a hammer and
    some poison and a radioactive isotope ... I forget exactly how this goes.
    Anyway, keep some bandages on hand, because I guarantee the cat won't be
    happy." -Jack-Jack Snyder

physics
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    From: Bert de Bruijn <bob@tristan.arts.kuleuven.ac.be>
    "Wanted, dead or alive : Schroedinger's cat."

physics
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    From: "Katy Moe" <katy@moe.net>

    Wanted, dead AND alive, Schrödingers Cat.

physics
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    From: "Rinaldo Zucca" <rz@cms.tuwien.ac.at>
    Wanted, |dead>, |alive> or 1/sqrt(2)(|dead> + |alive>): Schroedinger's cat.

physics
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    From: seashore@pirinen.demon.co.uk (Anetta Meriranta Pirinen)

    Schroedinger's Vet: Specializing in gassed cats and monkeys with
    Carpal-tunnel syndrome.

physics
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    Special Category: Erwin Schrödinger

    From: wombat@tiggs.demon.co.uk (wombat)

    "Here Kitty,Kitty" - Schrodinger

physics
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    From: ogod <ogod@my-dejanews.com>
    The Schrodingers Cat experiment in Quantum Physics:

    Take one ordinary cat, one large box, a particle detector, a radiation
    source, a bottle of cyanide gas. Hook up the detector so that if it detects
    a particle from the radiation source, it will open the cyanide gas. Set it
    up inside the box in such a way that there will be a 50% probability of a
    particle being detected from the radiation source within a five minute
    period. Add the cat to the box.

    Theory says that the cat will enter a quantum state where it is 50% alive
    and 50% dead until the experimenter looks inside the box. However, reality
    teaches us that the severly pissed off cat cat WILL escape the box well
    before the 5 minutes are up, attack the experimenter and depart just in
    time for the severly lacerated experimenter to watch the hammer decend on
    the cyanide bottle one inch from his nose.

physics
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    From: Lemming <l3mst0r@bumblbee.demon.co.uk>
    Curiosity *may* have killed Schrödinger's cat.

physics
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    From: "Leif Wahlberg" <passerby@swipnet.se>
    Do you knew what the cat said to Schrödinger when it jumped out of the box?
    "Damn you! Now I have only eight left"

physics
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    From: "Chuck Keelan" <CKEELAN@sternstewart.com>
    The Two Cat Experiment

    A panel with two slits is set up in front of a measuring device--a cat
    scanner.

    When numerous cats are fired at the panel, the scanner measures the
    expected interference pattern. But, when a single cat is fired through a
    single slit, the cat doesn't know if it's alive or dead.

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    From: al698@torfree.net (Christian Base)

    Why did Schrodinger sign his name this way?

            ..
            o
           r d
          h   i
         c     n
        S       g
                 e
                  r

    Because the dots over the "o" are actually a lone pair!

physics
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    Special Category: Werner Heisenberg

    From: emilsson@aries.scs.uiuc.edu (Tryggvi Emilsson)

     Historians have concluded that W.Heisenberg must have been contemplating
    his love life when he discovered the Uncertainty Principle:
    -When he had the time,he didn't have the energy
    and,
    -When the moment was right,he couldn't figure out the position...

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    Special Category: Werner Heisenberg
    From: "piet geelhoed" <heelgoed@zeelandnet.nl>
    Heisenberg is stopped by a traffic cop who askes: "Do you know how fast
    you were going?"
    Heisenberg replies: "No, but I know exactly where I am"

physics
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    From: "Chris Ball" <0cb14@qlink.queensu.ca>

    If a professor ever asks you where that assignment is that you didn't do,
    just say that you know its momentum so precisely that it could be almost
    anywhere in the universe.

physics
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    From: Giorgio Torrieri <orie0064@sable.ox.ac.uk>
    What did heisemberg say about sex?
    if you've got the position you haven't got the momentum & if you've got the
    energy you haven't got the time!

physics
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    From: shoulson@ctr.columbia.edu (Mark Shoulson)

    I heard this from a friend, David Kra. He says it's original:

    Q: What's the difference between a quantum mechanic and an auto mechanic?
    A: A quantum mechanic can get his car into the garage without opening the
    door.

physics
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    The Heineken Uncertainty Principle:
            You can never be sure how many beers you had last night.

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    Special Category: Richard Feynman
    From: billyfish@aol.com (BillyFish)

    One day in class, Richard Feynman was talking about angular momentum.  He
    described rotation matrices and mentioned that they did not commute.  He
    said that Sir William Hamilton discovered noncommutivity one night when he
    was taking a walk in his garden with Lady Hamilton.  As they sat down on a
    bench, there was a moment of passion.  It was then that he discovered that
    AB did not equal BA.

physics
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    Special Category: Werner Heisenberg
    From: J. Richard Jacobs (On the Science Jokes mailing list:
    http://www.egroups.com/group/sciencejokes
    Earlier today Dr. Heisenberg stated unequivocally that he may or may not
    have been responsible for the Uncertainty Principle.

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    Special Category: Albert Einstein
    Special Category: Werner Heisenberg
    From: "Fred Musante" <fmusante@connix.com>
    Einstein walks into a bar and says to the bartender, "I'll take a beer, and
    a beer for my friend, Heisenberg."

    The bartender looks around and asks, "Is your friend here?"

    "Well," says Einstein, "he is and he isn't."

physics
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    From: Neil Barnes

    I have a quantum car. Every time I look at the speedometer I get lost...
    barnacle.

physics
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    Special Category: Why the chicken crossed the road according to scientists
    Special Category: Erwin Schrödinger
    From: Stan Kegel <kegel@fea.net>
    Why did the chicken cross the road?
    Erwin Schroedinger:
    (1) She had to get to the farm, or did she?

    (2) Since the wording of the question implies the absence of an observer
    (else the fowl's motivation might easily be deduced), it is evident that
    the chicken simultaneously did _and_ did not cross the road. In the face of
    this, any speculation as to the bird's purpose must be viewed as mere
    sophistry -- and as such is beyond the bounds of this discussion.

    (3) Chicken? Chicken!? Where's my cat?

     (4) Until the actual act or non-act of crossing the road was observed,
    the act remained a cloud of probabilities.

physics
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    From: "Raymond Reichelt" <raymondreichelt@mb.sympatico.ca>
                               Life imitates science

    Original source:    Jeremy M.Posner     jposner@panix.com

You've got this somewhat feared ruler of a nation of several million people, and he's sitting in a bunker somewhere in Iraq. After several direct strikes at bunkers where he was supposedly sitting at the time, he's either dead or alive. At the same time, if you talk to the right people, he's neither dead nor alive and both dead and alive.

At some point, US forces will open the bunker, and as of that moment he will suddenly have been either dead or alive the whole time.

It took billions of dollars, but the US Government has finally created a real life example that can be used to demonstrate the multiple states of Schroedinger's Cat. And the best part is that the experiment can be easily reproduced. With, say, Geraldo

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    Special Category: Werner Heisenberg
    Special Category: Albert Einstein

    From: "Paul S. Szymanski" <sampunski@hotmail.com>
    Here is my attempt at a science joke:

    Albert Einstein and Werner Heisenberg were out walking in the country
    conversing at length on the subject of physics. After some time, Einstein
    said, "Werner, stop a minute."

    Both men stopped walking and Heisenberg asked, "What is it Albert?"  "I
    have been so immersed in thought that I have not been paying attention,
    where are we?"

    Heisenberg replied, "I'm not sure."

physics
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    From: David Coble (david.coble@equinox.org)

           How Many Generic Chickens Can You Fit Into a Generic Pontiac?

         A while back, someone asked how many generic chickens would fit into a
    generic Pontiac. This question has been on my mind recently, so I decided
    to work out this problem, for the benefit of all humanity.

    I. It has been proven successfully that chickens have a definite wave-like
       nature. In reproducing Thomas Young's famous double-slit experiment of
       1801, Sir Kenneth Harbour-Thomas showed that chickens not only diffract,
       but produce interference patterns as well. (This experiment is fully
       documented in Sir Kenneth's famous treatise "Tossing Chickens Through
       Various Apertures in Modern Architecture", 1897)

    II. It is also known, as any farmhand can tell you, that whereas if one
        chicken is placed in an enclosed space, it will be impossible to
        pinpoint the exact location of the chicken at any given time t. This
        was summarized by Helmut Heisenberg (Werner's younger brother) in
        the equation:
              d(chicken) * dt >= b
        (where b is the barnyard constant; 5.2 x10^(-14) domestic fowl *
        seconds)

    III. Whatever our results, they must be consistent with the fundamentals
         of physics, so energy, momentum, and charge must all be conserved.

         A. Chickens (fortunately) do not carry electric charge. This was
            discovered by Benjamin Franklin, after repeated experiments with
            chickens, kites, and thunderstorms.
         B. The total energy of a chicken is given by the equation:
                     E = K + V
            Where V is the potential energy of the chicken, and K is the
            kinetic energy of the chicken, given by
                     (.5)mv^2 or (p^2) / (2m).
         C. Since chickens have an associated wavelength, w, we know that
            the momentum of a free-chicken (that is, a chicken not enclosed
            in any sort of Pontiac) is given by: p = b / w.

    IV. With this in mind, it is possible to come up with a wave equation
        for the potential energy of a generic chicken. (A wave equation will
        allow us to calculate the probability of finding any number of
        chickens in automobiles.) The wave equation for a non-relativistic,
        time-independant chicken in a one- dimensional Pontiac is given by:
              [V * P] - [[(b^2) / (2m)] * D^2(P)] = E * P
        P is the wave function, and D^2(P) is its second derivative.
             The wave equation can be used to prove that chickens are in
             fact quantized, and that by using the Perdue Exclusion formula
             we know that no two chickens in any Pontiac can have the same
             set of quantum numbers.

    V. The probability of finding a chicken in the Pontiac is simply the
       integral of P * P * dChicken from 0 to x, where x = the length of the
       Pontiac. Since each chicken will have its own set of quantum numbers
       (when examining the case of the three-dimensional Pontiac) different
       wave functions can be derived for each set of quantum numbers.
            It is important to note that we now know that there is no such
       thing as a generic chicken.  Each chicken influences the position and
       velocity of every other chicken inside the Pontiac, and each chicken
       must be treated individually.
            It has been theorized that chickens do in fact have an intrinsic
       angular momentum, yet no experiment has been yet conducted to prove
       this, as chickens tend to move away from someone trying to spin them.
            Curious sidenote: Whenever possible, any attempt to integrate a
       chicken should be done by parts, as most people will tend to want the
       legs (dark meat), which can lead to innumerable family conflicts
       which are best avoided if at all possible.

         The Prestidigitator, Drew Physics Major Extraordinary
         24 March 1988

physics
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    From: scottd@cory.eecs.berkeley.edu (Scott Davies)

    		   News From the Physics Frontier:
    	      Murphy's Law Proven with Quantum Mechanics
                 --------------------------------------------

        In a startling new development in the field of physics, U.C.  Berkeley
    professor Erwin Brodinger claims to have proven the validity of Murphy's
    Law--the "law" which states that anything that can go wrong will do so, and
    at the worst possible moment--with quantum mechanics.

        "I won't go into the details," said Brodinger, "because it'd take you
    50 years to understand them (if you're lucky).  Suffice it to say that
    computer simulation has shown that, given the universe's most probable
    configuration, the quantum mechanical state corresponding to an intelligent
    being saying 'Holy shit!  I'm FUCKED!' in its native language happens to be
    an extremely likely one.  This is just one of several theoretical
    predictions I've worked out which show the vailidity of Murphy's Law."

        Perhaps the most significant of these other predictions is what has
    become known the the physics community as the paradox of Brodinger's Dog.

       "Basically, the idea behind Brodinger's Dog is that when a poodle takes
    a dump, the resulting doodie isn't really here, there, or anywhere in
    particular.  It's in a quantum-mechanical superposition of locations,
    smeared out exponentially over a 10-foot or so radius-- until, that is, an
    observer steps into the general vicinity.  Then, and only then, does it
    decide where it really is.  As it turns out, unfortunately, 97.4% of the
    time it decides it's right under the observer's foot."

        Does this only hold for poodles?

        "Well, while doing the calculations, I made a minor simplification: in
    the models I used, the dog was assumed to be about half the size of an
    atomic nucleus.  While I'm positive this assumption wouldn't prevent my
    results from applying to small dogs, I'm not sure about really big dogs,
    like, say, German Shepherds."

        In collaboration with another Berkeley professor, Wiener Heifenburg,
    Brodinger also helped to formulate the Heifenberg Certainty Principle,
    which is stated as follows: the certainty that you are about to make an
    incredibly stupid and embarrassing mistake is directly proportional to the
    total importance of the people currently watching you.

        Brodinger says his work was inspired by an instance last summer in
    which he was maimed by a pack of rabid platypuses marauding the south side
    of campus.  "Right before a hot date I had that night, too," the professor
    sighed.

physics
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    From: "G. P." <GP@GP.Com>

    Every Friday afternoon, a mathematician goes down to the bar, sits in the
    second-to-last seat, turns to the last seat, which is empty, and asks a
    girl who isn't there if he can buy her a drink.

    The bartender, who is used to weird university types, always shrugs but
    keeps quiet. But when Valentine's Day arrives, and the mathematician makes
    a particularly heart-wrenching plea into empty space, curiosity gets the
    better of the bartender, and he says, "I apologize for my stupid questions,
    but surely you know there is NEVER a woman sitting in that last stool. Why
    do you persist in asking out empty space?"

    The mathematician replies, "Well, according to quantum physics, empty space
    is never truly empty. Virtual particles come into existance and vanish all
    the time. You never know when the proper wave function will collapse and a
    girl might suddenly appear there."

    The bartender raises his eyebrows. "Really? Interesting. But couldn't you
    just ask one of the girls who comes here every Friday if you could buy HER
    a drink? Never know... she might say yes."

    The mathematician laughs. "Yeah, right -- how likely is THAT to happen?"

physics
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    From: dmura@carlsbadnm.com (D'Mura)
                       IF A MAN ALONE IN THE WOODS SPEAKS...

    The question was raised:   "If a man alone in the woods speaks, and his
    wife cannot hear him, is he still wrong?"

    I have considered this question in light of the principles of Modern
    Physics and offer my thesis, dedicated to my wife, who anchors me in
    reality.

    In the year 1900 Max Planck discovered that the energy of light is
    quantified.  In 1905 Albert Einstein used Planck's Constant to write the
    theory of the Photoelectric Effect, that light behaves as a particle
    when it comes to energy transfer.  Louis de Broglie proposed that
    particles can have a wave nature and this fact was later verified.

    These discoveries led Neils Bohr to propose a radical theory of the
    atom, which was partially successful in explaining the emission spectra
    of the hydrogen atom.  Neils Bohr was compelled to introduce the
    Principle of "Complementarity," that light is both a particle and a
    wave.

    The modern theories were extended when Max Born showed that the
    distribution of energy was a function of probability. Further, Warner
    Heisenberg wrote the Principle of Uncertainty, which says that it is
    impossible to determine the exact location of an electron and the vector
    direction of its momentum at the same time.

    This was followed with the master stroke penned by Erwin Schrodinger.
    Using the "Psi function" of Quantum Mechanics, Schrodinger could map the
    "wave field" of any particle, thus giving us a theoretical explanation
    for the structure of an atom and the entire periodic table of the
    elements.

    The Quantum mechanics predicts that a wave of a single frequency would
    stretch out to infinite proportions, the superposition of a narrow range
    of frequencies produces a standing wave function which can be localized
    to a much more precise location.  Thus the electron and its position
    within an atom becomes a cloud of probability.

    From this I infer that there are such states as being right and being
    wrong, within certain parameters of uncertainty.  Applying the Psi
    function,  the more vague the statement of the man the greater the
    probability of him being correct.  The narrower and more specific his
    utterance the greater the  likelihood of his being wrong.

    Also, the Principle of Complementarity assures us that if a man alone in
    the woods speaks, and his wife can not hear him, he is BOTH right and
    wrong until he comes out of the woods.

    In the analogy of Schrodinger's Cat, the cat in the box is both dead and
    alive until someone opens the lid.  The act of observing the phenomenon
    determines the outcome.

    Thus, the inevitable conclusion is that it doesn't matter what the man
    says only his wife can determine whether or not he is correct.

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    From: Damon C Capehart (dcapehar@utdallas.edu)
    "Heisenberg was an unfortunate fellow; he knew *exactly* how fast his
    car keys were going."

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    From : tomas_thefox2003@yahoo.ie (Tomás Fuchsbauer)

    An every-day explanatory version of Heisenberg’s uncertainty principle
    stumbled upon back in the mid 1990’s. I doubt that it will lead to
    acquisition of the nobel prize for physics however. Strange how it almost
    appears that Murphy had a key voice in this...  Heisenberg’s Uncertainty
    Principle : The location of all bodies in the universe cannot be known
    simultaneously.

    Corrollary : If an object is located, something else will disappear.

    From: "Horst Kiehl" <h.p.kiehl@fz-juelich.de>

    Apparently, the corollary is under the precondition that the observer
    has maximized his/her knowledge of the locations of objects. Then, the
    corollary implies that the disappearance of another object is not due
    to a specific obliviousness of the observer. However, it does not
    imply further whether Heisenberg's Uncertainty Principle causes the
    observer's knowledge of another object's location to change
    significantly - false obliviousness due to Heisenberg's Uncertainty
    Principle - or another object, whose location was known to the
    observer, to change its location significantly - spontaneous
    acceleration due to Heisenberg's Uncertainty Principle.

    Some more thoughts - the discovery of one object might coincide with
    the creation of a number of locons and dislocons. If they get outside
    the observer's head then the locons fix the located object in its
    place (or more exactly shield it from acceleration or deceleration),
    while the dislocons go elsewhere and cause another object to
    get lost (accelerate or decelerate it). The observer's brain might act
    as a natural DASER (Dislocation radiation Amplification by etc.). Of
    course the reason that not all locon-dislocon pairs cancel out each
    other immediately would be Heisenberg's Uncertainty Principle.

    In summary, if you know "every thing" then you must be careful when
    you might learn "some thing else", maybe especially if the new thing
    would remind you of one you already know.

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    From: Daniel F Boyd (boyd@cs.buffalo.edu)
                    Change notice -- Planck's constant upgraded

    [This is the actual format which our Computing Center uses for
    change notices.]

    Effective: September 15, 1993
      Product: Planck's constant 'h'
      Version: 1.1 (Replaces 1.0)
      Systems: The universe as we know it
       Change: Upgrade to '2'.
        Image: Every atom and photon in the observable universe
    Installer: God the Father, Son, and Holy Spirit
      Contact: Richard P. Feynman

        Notes: The referenced change to this physical constant will
      end all life as we know it on this planet and in the
      observable universe.  From the equation E=hf which
      denotes the energy of a photon as the function of its
      frequency, we see that photons will suddenly carry
      much much more energy.  The emissions from your TV
      remote will become as dangerous as gamma rays; you
      would shoot holes in the wall with it, except that the
      Uncertainty Principle says you won't be able to pick
      up the remote because you won't be able to determine
      its position (nor the position of your hand) to enough
      precision to tell you if it's even in the same room
      with you.

      Users inconvenienced by this change should call the
      Help Desk in 216 Computing center(645-3540) or the
      Graphics Consultant in 204 Computing Center.

physics
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    Special Category: Why the chicken crossed the road according to scientists
    Q: Why did the chicken cross the road?
    René Blondot: My discovery the N-Chicken not only crosses roads, but also
      railroads, roadblocks, roadrunners...

next page | Index | Comments and Contributions

#### Subsections

- 2. physics - general
- 2.1 physics poetry
- 2.2 physics quotes
- 2.3 physics puns
- 2.4 pseudo physics (cat physics, cartoon physics)
- 2.5 new physical theories
- 2.6 learning physics
- 2.7 not learning physics (featuring Heavy Boots)
- 2.8 physical proofs
- 2.9 physical one-liners
- 2.10 quantum mechanics (starring Schroedingers cat!)
- 2.11 relativity
- 2.12 measure the height of a building with help of a barometer
- 2.13 physicists
- 2.14 astronomy
- 2.15 electrons
- 2.16 electro-magnetism and light
- 2.17 Newtons's laws and classical dynamics
- 2.18 thermodynamics
- 2.19 in the lab
- 2.20 strange but real findings
- 2.21 the buttered bread on cat problem

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