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In a photoelectric experiment, if the frequency of light is just above the thres

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Question: In a photoelectric experiment, if the frequency of light is just above the threshold frequency, what can be said about the emitted electrons?

Options:

  1. They have maximum kinetic energy
  2. They are emitted with zero kinetic energy
  3. They are emitted with high kinetic energy
  4. No electrons are emitted

Correct Answer: They are emitted with zero kinetic energy

Solution: 

If the frequency of light is just above the threshold frequency, the emitted electrons will have zero kinetic energy, as all the energy is used to overcome the work function.

In a photoelectric experiment, if the frequency of light is just above the thres

Practice Questions

Q1
In a photoelectric experiment, if the frequency of light is just above the threshold frequency, what can be said about the emitted electrons?
  1. They have maximum kinetic energy
  2. They are emitted with zero kinetic energy
  3. They are emitted with high kinetic energy
  4. No electrons are emitted

Questions & Step-by-Step Solutions

In a photoelectric experiment, if the frequency of light is just above the threshold frequency, what can be said about the emitted electrons?
  • Step 1: Understand the threshold frequency. This is the minimum frequency of light needed to release electrons from a material.
  • Step 2: Recognize that when light of frequency just above the threshold frequency hits the material, it can release electrons.
  • Step 3: Know that the energy of the incoming light is used to overcome the work function, which is the energy needed to release an electron.
  • Step 4: If the frequency of light is just above the threshold frequency, it means the energy provided by the light is just enough to overcome the work function.
  • Step 5: Since all the energy from the light is used to overcome the work function, the emitted electrons will have no extra energy left over.
  • Step 6: Therefore, the emitted electrons will have zero kinetic energy.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient frequency.
  • Threshold Frequency – The minimum frequency of light required to emit electrons from a material.
  • Kinetic Energy of Emitted Electrons – The energy of emitted electrons, which is determined by the difference between the energy of the incoming photons and the work function of the material.
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