A2 Physics Quantum Physics

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20 Terms

1
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what is a photon

a quantum of energy when the energy is in the form of electromagnetic radiation

2
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formula for photon energy

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3
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convert from electron volt (eV) to joules (J)

multiply by 1.6 Ă— 10^-19

4
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formula for momentum of photon

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5
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what are emitted from a metal surface when illuminated by electromagnetic radiation

photoelectrons

6
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what is threshold frequency

minimum frequency of incident electromagnetic radiation required to remove a photoelectron

7
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what is threshold wavelength

longest wavelength needed to remove a photoelectron

8
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formula for photoelectric emission

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9
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what is the effect of intensity on maximum kinetic energy of photoelectrons

there is no effect because increase in intensity onky increases the number of photoelectrons leaving the surface

10
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what is the effect of intensity on photoelectric current

they are proportional because photoelectric current refers to number of photoelectrons emitted which increases with intensity

11
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what is photoelectric effect

emission of electrons when electromagnetic radiation is incident

12
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what is work function energy

minimum energy for an electron to leave the surface

13
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explain the evidence provided by the electron diffraction for the wave nature of particles

14
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what is de Broglie wavelength

the wavelength associated with a moving particle

15
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formula for de Broglie wavelength

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16
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how do you describe the electron energy levels in isolated atoms

they are discrete

17
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how does emission and absorption line spectra look like

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18
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how is an emission spectra made

  • electron transitions from higher energy level to lower energy level → emission of photon

  • represented by computed lines in a black background

19
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how does an absorption spectra form

  • when an electron transitions from low to high energy → due to absorption of photon

  • a continuous spectrum with black lines at certain wavelengths

20
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formula for difference between two energy levels

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