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In the photoelectric effect, what happens to the emitted electrons if the freque

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Question: In the photoelectric effect, what happens to the emitted electrons if the frequency of the incident light is just at the threshold frequency?

Options:

  1. They are emitted with maximum kinetic energy
  2. They are emitted with zero kinetic energy
  3. They are not emitted
  4. They are emitted with negative kinetic energy

Correct Answer: They are emitted with zero kinetic energy

Solution: 

At the threshold frequency, the energy of the incident photons is equal to the work function, resulting in emitted electrons having zero kinetic energy.

In the photoelectric effect, what happens to the emitted electrons if the freque

Practice Questions

Q1
In the photoelectric effect, what happens to the emitted electrons if the frequency of the incident light is just at the threshold frequency?
  1. They are emitted with maximum kinetic energy
  2. They are emitted with zero kinetic energy
  3. They are not emitted
  4. They are emitted with negative kinetic energy

Questions & Step-by-Step Solutions

In the photoelectric effect, what happens to the emitted electrons if the frequency of the incident light is just at the threshold frequency?
  • Step 1: Understand that the photoelectric effect involves light hitting a material and causing electrons to be emitted.
  • Step 2: Know that light is made of particles called photons, which have energy based on their frequency.
  • Step 3: Recognize that each material has a specific energy level called the work function, which is the minimum energy needed to release an electron.
  • Step 4: Identify the threshold frequency as the frequency of light where the energy of the photons is just enough to equal the work function.
  • Step 5: Realize that when the frequency of the incident light is at the threshold frequency, the energy of the photons is exactly equal to the work function.
  • Step 6: Conclude that the emitted electrons will have zero kinetic energy because all the energy from the photons is used to overcome the work function, leaving no extra energy for movement.
  • 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 incident light required to emit electrons from a material, where the energy of the photons equals the work function.
  • Kinetic Energy of Emitted Electrons – The energy of the emitted electrons, which is zero at the threshold frequency since all photon energy is used to overcome the work function.
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