Quantum Physics - CAIE

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6 Terms

1
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Define the photon

A quantum of energy of electromagnetic radiation

2
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What is the photoelectric Effect [2 marks]

  • Emission of electron

  • When EM radiation is incident (on surface)

3
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Define the work function

The minimum energy needed by an electron to free itself from the surface of a metal. Work function is a property of the metal.

4
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Define the De Broglie Wavelength

The wavelength associated with a moving particle

5
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Explain why the maximum kinetic energy of the electron emitted from a metal surface is independent of the intensity of the incident electromagnetic radiation. [3 marks]

  • The frequency of a photon determines its energy.

  • The intensity of light determines the number of photons per unit time.

  • The intensity of light does not determine the energy of a photon.

  • The kinetic energy of an electron depends on the energy of one photon.

6
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What is the equation linking momentum of a photon and its energy?

p = E/c, where c = speed of light in a vacuum.

<p>p = E/c, where c = speed of light in a vacuum.</p>