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PChem > Final Unit 1 > Flashcards

Final Unit 1 Flashcards

1
Q

What are the two major observations to support the quantization of energy?

A

Blackbody radiation
Photoelectric effect

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2
Q

Explain how the photoelectric effect happens?

A

Light hits a metal surface and electrons from the metal are emitted. The electrons dont like to leave the metal because it takes energy but the light gives it the energy it needs. the amount of energy that the electrons leave with depends on the wavelength of light.

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3
Q

What is the length of red light and what is its energy like?

A

short and low energy

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4
Q

What is the length of UV light and what is its energy like?

A

longer wavelength and higher energy

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5
Q

What is the relationship between wavelength and frequency?

A

they are inverse

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6
Q

How is energy of the light and wavelength related?

A

inversely proportional

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7
Q

How is energy of the light and frequency related?

A

directly proportional

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8
Q

How is energy of the light and intensity related?

A

directly proportional

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9
Q

What is another word for intensity of the light?

A

brightness

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10
Q

What is the equation for kinetic energy of the electron?

A

KE_e=Elight- phi (work function)

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11
Q

Explain the expectation vs the outcome of the photoelectric effect and its relation with intensity?

A

The expectation is it should work if the intensity is high enough because Inetnsity is proportional to energy. However, this is not the case because you only get potential enegry if the frequency is greater than vo. So v>vo

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12
Q

What is another word for the amplitude of a photon?

A

The intensity

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13
Q

What determines the color of the photon?

A

wavelength

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14
Q

What is the smallest piece of light?

A

a photon

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15
Q

What is the equation for the energy of the photon?

A

Ephoton=hv= hc/lamda

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16
Q

What is it called when an electron in an atom gains energy?

A

absorption

17
Q

What is it called when an electron in an atom loses energy?

A

emission

18
Q

Explain atomic excitation and emission.

A

When a photon is directed at an atom, the electron goes from the ground state to the excited state, it falls back down to the ground state, loses energy and emits a photon

19
Q

Explain the Bohr Model for a hydrogen atom.

A

tiny electron orbits a massive proton on a ring pathway. It has a quantized radi and quantized energy levels. It predicts the locations of spectral lines

20
Q

Negative potential energy is ____.

A

attraction

21
Q

Positive potential energy is ____.

A

Repulsion

22
Q
A

PChem (11 decks)

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