2.4 Flashcards

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1
Q

What is photoemission?

A

Photons of a sufficient energy can eject electrons from the surface of certain materials. This is called the photoelectric effect.

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2
Q

What does the photoelectric effect show about the nature of light?

A

evidence of the particle model of light

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3
Q

What is a photon?

A

A fundamental particle that carries electromagnetic force, or in simpler terms, a light particle.

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4
Q

How does the energy of a photon relate to its frequency?

A

The higher the energy of a photon, the higher the frequency.

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5
Q

Break down the equation E = hf

A

E = energy (J)
h = Planck’s constant (6.63x10^-34)
f = frequency (Hz)

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6
Q

What is threshold frequency?

A

The minimum frequency required to cause photoemission

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7
Q

What is the work function?

A

The minimum energy required to remove an electron from a material (photoemission)

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8
Q

Give an equation that shows the relationship between work function and threshold frequency

A

W = hf
o

W = work function (J)
h = Planck’s Constant (Js)
f = threshold frequency (Hz)

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9
Q

How do you calculate the kinetic energy of a photon?

A

Ek = E - W

Ek = kinetic energy (J)
E = energy of photon (J)
W = work function (J)

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10
Q

Given that the work function is related to threshold frequency, give another ways that this equation can be written

A

Ek = hf - h(fo)

Ek = kinetic energy (J)
h = Planck’s constant (Js)
f = frequency of photon (Hz)
fo = threshold frequency (Hz)

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