What is thermionic emission?
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When a metal is heated, giving the free electrons in it enough energy to
escape, producing a beam of electrons
What were Planck's three interpretations that explained the ultraviolet catastrophe?
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, 1. Energy is emitted as quanta (photons)
2. A quantum is related to a single frequency
3. A quantum has energy = hf, so higher frequencies are carried as bigger
packets of energy
What does the wave theory predict would happen in the photoelectric effect?
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Wave theory states that intensity is proportional to the energy carried by a
wave, so the greater the intensity the greater the kinetic energy of the
photoelectrons. It also states that each electron would gain a little bit of
energy from an incoming wave, so emission would occur at all frequencies but
there would be a delay.
Give four reasons why Newton's theory of light was preferred over Huygens
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Newton's reputation was stronger due to work on gravity and motion, no
experimental evidence for diffraction or interference, no experimental
evidence of how speed of light changes in denser material, fit better with
understanding of physics at the time.
What is the main principle of time dilation?
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, A moving clock runs slow. Time runs slower for an observer moving relative to
an event.
What does Einstien's equation of relativistic mass tell us?
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It tells us that as speed increases, mass increases. As speed approaches the
speed of light, the mass approaches infinity. Therefore, no object with mass
can move at or above at the speed of light as its mass will reach infinity.
Why was Thomson's measured value of the specific charge of the electron significant
compared to that of a hydrogen ion?
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Thomsons measured value was about 1800 times larger than the hydrogen ions
(protons). The mass of a proton is about 1800 times greater than an electrons,
and so it was proven that the magnitudes of the charge on a proton and
electron are equal.
How did Newton's theory of light explain refraction?
Give this one a try later!
Give this one a try later!
When a metal is heated, giving the free electrons in it enough energy to
escape, producing a beam of electrons
What were Planck's three interpretations that explained the ultraviolet catastrophe?
Give this one a try later!
, 1. Energy is emitted as quanta (photons)
2. A quantum is related to a single frequency
3. A quantum has energy = hf, so higher frequencies are carried as bigger
packets of energy
What does the wave theory predict would happen in the photoelectric effect?
Give this one a try later!
Wave theory states that intensity is proportional to the energy carried by a
wave, so the greater the intensity the greater the kinetic energy of the
photoelectrons. It also states that each electron would gain a little bit of
energy from an incoming wave, so emission would occur at all frequencies but
there would be a delay.
Give four reasons why Newton's theory of light was preferred over Huygens
Give this one a try later!
Newton's reputation was stronger due to work on gravity and motion, no
experimental evidence for diffraction or interference, no experimental
evidence of how speed of light changes in denser material, fit better with
understanding of physics at the time.
What is the main principle of time dilation?
Give this one a try later!
, A moving clock runs slow. Time runs slower for an observer moving relative to
an event.
What does Einstien's equation of relativistic mass tell us?
Give this one a try later!
It tells us that as speed increases, mass increases. As speed approaches the
speed of light, the mass approaches infinity. Therefore, no object with mass
can move at or above at the speed of light as its mass will reach infinity.
Why was Thomson's measured value of the specific charge of the electron significant
compared to that of a hydrogen ion?
Give this one a try later!
Thomsons measured value was about 1800 times larger than the hydrogen ions
(protons). The mass of a proton is about 1800 times greater than an electrons,
and so it was proven that the magnitudes of the charge on a proton and
electron are equal.
How did Newton's theory of light explain refraction?
Give this one a try later!
