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If the intensity of light is doubled while keeping the frequency constant, what

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Question: If the intensity of light is doubled while keeping the frequency constant, what happens to the number of emitted electrons?

Options:

  1. It doubles
  2. It remains the same
  3. It is halved
  4. It becomes zero

Correct Answer: It doubles

Solution: 

Doubling the intensity of light increases the number of photons incident on the surface, which in turn increases the number of emitted electrons, assuming the frequency is above the threshold frequency.

If the intensity of light is doubled while keeping the frequency constant, what

Practice Questions

Q1
If the intensity of light is doubled while keeping the frequency constant, what happens to the number of emitted electrons?
  1. It doubles
  2. It remains the same
  3. It is halved
  4. It becomes zero

Questions & Step-by-Step Solutions

If the intensity of light is doubled while keeping the frequency constant, what happens to the number of emitted electrons?
  • Step 1: Understand that light is made up of particles called photons.
  • Step 2: Know that the intensity of light refers to how many photons are hitting a surface.
  • Step 3: Recognize that if the intensity of light is doubled, it means there are now twice as many photons hitting the surface.
  • Step 4: Remember that each photon can potentially cause the emission of one electron from the surface, provided the frequency of the light is high enough.
  • Step 5: Since the frequency is kept constant and is above the threshold frequency, doubling the number of photons will lead to doubling the number of emitted electrons.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient frequency.
  • Intensity and Photon Count – Intensity of light is related to the number of photons; doubling intensity means doubling the number of photons if frequency is constant.
  • Threshold Frequency – The minimum frequency of light required to emit electrons from a material; if frequency is above this, electrons will be emitted.
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