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Physics > Quantum physics > Flashcards

Quantum physics Flashcards

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1
Q

Definition

Photoelectric effect

A

Interaction between a photon and an electron, electron is removed from the surface of the metal

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2
Q

Definition

Photon

A

Quantum of electromagnetic energy

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3
Q

Formula

Einstein relation equals

A

Planck constant * frequency

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4
Q

Definition

Electronvolt (eV)

A

Energy gained by an electron travelling through a potential difference of 1 volt.

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5
Q

Formula

Electron speed aproaching to speed of light equals

A

sqrt(2 * electron charge * voltage / mass)

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6
Q

Definition

Threshold frequency

A

Minimum frequency of incident radiation that would eject electron from the surface of the metal

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7
Q

Defintion

Threshold wavelength

A

Maximum wavelength of incident radiation that would eject electron from the surface of the metal

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8
Q

Formula

Threshold frequency equals

A

Work function / planck constant

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9
Q

Definition

Work function (energy)

A

Minimum energy for an electron to free itself from the surface of metal

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10
Q

Formula

Einstein’s photoelectric function

A

planck constant * frequency = work function + max kinetic energy

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11
Q

Explanation

Emission of electron happens immediately

A

1 photon interacts with 1 electron. If work function is higher, electron will be ejected instantaneously

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12
Q

Explanation

Low intensity radiation is effective

A

Energy of photono depends on the frequency or wavelength. Low intensity imply smaller rate of emission of electron.

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13
Q

Explanation

Increasing the intensity of radiation increases rate of electron leave metal

A

Greater intensity means greate rate of photon incident (threshold frequency exceeded)

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14
Q

Explanation

Increase intensity has no effect on KE

A

It depends on frequency, with max KE = hf - work function

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15
Q

Formula

Momentum of photon

A

Energy / speed of light

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16
Q

Formula

Number of photon per second

A

Power / number of each photon

17
Q

Definition

Energy levels

A

A quantized state of an electron in an atom

18
Q

Formula

Photon energy (difference between 2 levels) equals

A

Planck constant * frequency = E1- E2

19
Q

Definition

De Broglie wavelength

A

Wavelength associated with a moving particle

20
Q

Formula

De Broglie wavelength equals

A

Planck constant / momentum

Physics (10 decks)

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