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In the photoelectric effect, what happens to the kinetic energy of emitted elect

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Question: In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)

Options:

  1. Increases
  2. Decreases
  3. Remains constant
  4. Becomes zero

Correct Answer: Increases

Exam Year: 2021

Solution: 

According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.

In the photoelectric effect, what happens to the kinetic energy of emitted elect

Practice Questions

Q1
In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
  1. Increases
  2. Decreases
  3. Remains constant
  4. Becomes zero

Questions & Step-by-Step Solutions

In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
  • Step 1: Understand the photoelectric effect. This is when light hits a material and causes it to emit electrons.
  • Step 2: Know that light has a frequency, which is how often the light waves pass a point in one second.
  • Step 3: Learn about the threshold frequency. This is the minimum frequency of light needed to emit electrons from the material.
  • Step 4: If the frequency of the incident light is below the threshold frequency, no electrons are emitted.
  • Step 5: If the frequency of the incident light is above the threshold frequency, electrons are emitted.
  • Step 6: Understand that as the frequency of the incident light increases (above the threshold), the kinetic energy of the emitted electrons also increases.
  • Step 7: Remember that kinetic energy is the energy of motion, so higher frequency light gives the electrons more energy.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient frequency.
  • Kinetic Energy of Electrons – The energy that the emitted electrons possess, which increases with the frequency of the incident light above a certain threshold.
  • Threshold Frequency – The minimum frequency of incident light required to emit electrons from a material.
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