Crooke's Tube & Electrons

00:06:04
https://www.youtube.com/watch?v=Ka3v5dIQGOI

Ringkasan

TLDRIn this video, the presenter describes how Dalton's atomic model was proven incomplete through experiments with a Crooks tube. The Crooks tube is a glass tube that is mostly evacuated and contains electrodes, which are used to observe the behavior of charged particles in the presence of a magnetic field. By using a Tesla coil to generate high voltage, the presenter shows that certain light (charged particles) is affected by the magnetic field, while uncharged light remains unaffected. This led to the discovery of electrons as charged particles within atoms, credited to scientist JJ Thompson. The demonstration enhances the understanding of atomic structure and the nature of charge.

Takeaways

  • 🧪 Crooks tube helps show atomic particle behavior.
  • ⚡ Tesla coils generate high voltage for experiments.
  • 🔍 Magnets affect charged particles, not uncharged light.
  • 🌌 Discovery of electrons changed atomic theory.
  • 🔗 JJ Thompson's experiments revealed charges in atoms.

Garis waktu

  • 00:00:00 - 00:06:04

    The discussion begins with Crooks Tube, an evacuated glass tube with electrodes. The presenter explains how it interacts with a Tesla coil generating high voltage. When the coil is activated, it demonstrates electric behavior in the Crooks Tube, visible as a green line on the screen for the audience. The segment highlights the phenomenon of magnet-induced deflection of charged particles, comparing it to a regular green laser light which remains unaffected by magnets. This observation leads to questions about the nature of light and charge. The presenter clarifies the distinction between charged particles (the electrons) responsible for deflection in a charged environment versus uncharged light, ultimately leading to the discovery of electrons by scientist JJ Thompson, who theorized that atoms contain these charged particles.

Peta Pikiran

Video Tanya Jawab

  • What is a Crooks tube?

    A Crooks tube is a glass tube that is mostly evacuated and contains electrodes, used to study electric currents.

  • What role does the Tesla coil play?

    The Tesla coil generates high voltage, allowing for the observation of effects on charged particles.

  • Who discovered electrons?

    JJ Thompson discovered electrons during his experiments with Crooks tubes.

  • Why does the magnet affect some light and not others?

    The magnet affects charged particles, while uncharged light, like a laser, is not influenced by the magnetic field.

  • What charges do magnets interact with?

    Magnets interact with charged particles, either attracting or repelling them based on their charge.

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Gulir Otomatis:
  • 00:00:00
    so what I'm going to show you today is
  • 00:00:03
    how they figured out that Dalton's model
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    was not
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    complete and it began with this thing
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    called a Crooks
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    tube has anyone seen a Crooks Tube
  • 00:00:14
    before this is a Crooks tube what it is
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    is it's a tube of glass that's mostly
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    evacuated meaning most of the air is
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    taken out of it and it's got an
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    electrode on this side and an electrode
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    on that side if you look on the inside
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    of it there's a white screen and the
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    white screen uh is there for reasons
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    I'll show you in a
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    moment
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    this
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    is a Tesla
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    coil Tesla coils generate lots of
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    voltage so right now there's a magnet
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    inside of here that's
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    spinning and it's got a some wires
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    around that magnet it's generating a lot
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    of uh
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    voltage as it spins to the strong magnet
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    in fact if I hold another magnet up here
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    I can feel it vibrating from the
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    spinning of the
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    magnet kind of like your Rumblers on
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    your game
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    controllers and uh but this is
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    generating a lot of
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    electricity you can see that if you hold
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    it up to something metal
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    people always ask what will happen if
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    you touch it answer should
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    die why I am now
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    dead a little bit
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    uncomfortable but in any case uh here's
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    what happens when you hold it across a
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    Crooks tube
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    I see that you see it over there on that
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    side I see
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    it pretty
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    cool uh I I actually can't see it from
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    my side but I assume you're seeing a
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    straight Green
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    Line mostly why can't you see it because
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    I'm looking from
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    behind that white screen's only on the
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    front it's set up to be vied from one
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    side
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    only all right
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    now this is kind of
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    interesting watch
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    [Music]
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    this is anything
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    happening what's happening
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    H it's following it's following the
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    magnet reacting to the magnet it's
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    deflecting the
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    magnet okay
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    so that's kind of interesting keep that
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    going I got a uh one other thing to
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    uh compare that to I have
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    a light
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    here and I have I'm going to pass this
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    light it's a it's a laser light a green
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    laser light can't
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    that don't film in oh there we go see so
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    you see that uh that laser light see it
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    there what'll happen to it when I get it
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    close to the
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    magnet deflect away he says
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    [Music]
  • 00:04:00
    is it deflecting
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    away it has no effect on the mag the
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    magnet has no effect on it I
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    can so why does some light get deflected
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    by a magnet and some other light doesn't
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    why is that what's the primary
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    difference why why why why why why why
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    the answer is do anybody know what is
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    different about that light from this
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    light why are they different what's one
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    have that the other
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    doesn't high
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    voltage uh yes this specific word we're
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    looking for here one's charged by
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    electricity while another one's charged
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    by battery oh batteries uh batteries are
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    electricity but you kind of got the
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    right word there
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    charge is the key it turns out that this
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    light isn't charged at all it's just
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    light this is obviously it's charged
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    because that's what magnets do is they
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    deflect charges they'll either make
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    things go towards them or away from them
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    depending on if it's plus or minus or
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    the North or South Pole of the magnet
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    and so what we have discovered here is
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    that there's something going through
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    here that is charged something's jumping
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    out of this metal electrode into this
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    metal electrode that is charged and
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    since these metal electrodes are made of
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    atoms then atoms must have something
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    charged in them and JJ
  • 00:05:43
    Thompson is a scientist on our paper
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    that we researched this is what he
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    discovered he discovered that these
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    things the atoms had these charges
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    inside them
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    called electrons those are actually
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    electrons uh going across there and JJ
  • 00:06:02
    Thompson discovered them
Tags
  • Crooks tube
  • Tesla coil
  • Dalton's model
  • JJ Thompson
  • electrons
  • magnetic field
  • charged particles
  • atomic structure
  • science experiments
  • light