Photon

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

• More electrons are emitted in a given time interval

• Fewer electrons are emitted in a given time interval

• Emitted electrons are more energetic

• Emitted electrons are less energetic

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A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?

• More electrons are emitted in a given time interval

• Fewer electrons are emitted in a given time interval

• Emitted electrons are more energetic

• Emitted electrons are less energetic

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NGSS.HS-PS4-3

The photoelectric effect only occurs if the light shining on the metal is:

• coherent.

• above a minimum intensity.

• above a minimum frequency.

• above a minimum wavelength.

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Planck's constant can be found ...

• energy of a particle x speed of light / wavelength

• energy of a particle x speed of light / frequency of light

• energy of a particle x wavelength / speed of light

• slope of the cut-off voltage vs frequency graph

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the minimum frequency for which the photoelectric effect can occur is called the

• absolute frequency

• cut off frequency

• Lyman frequency

• threshold frequency

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All electromagnetic waves...

• travel at the speed of light

• can be reflected

• can exhibit interference

• all of the above

When light of specific frequencies is shined on a surface, electrons are ejected from the surface. This is the idea behind...

• Quantization of Energy

• Photoelectric Effect

• Compton Effect

• deBroglie Waves

• Uncertainty Principle

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What happens during Compton scattering?

• An electron is ejected from the nucleus

• A photon is scattered and an electron is ejected

• A positron-electron pair is produced

• A photon is completely absorbed

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What is a photon?

• A particle of light

• A wave of sound

• A type of electron

• A neutron

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Which of the following best describes the energy of a photon?

• Directly proportional to its wavelength

• Inversely proportional to its frequency

• Directly proportional to its frequency

• Independent of its frequency

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