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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 in the photoelectric effect?

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 in the photoelectric effect?
  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 in the photoelectric effect?
Correct Answer: Number of emitted electrons increases.
  • 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 frequency is related to the energy of each photon, but in this case, it remains constant.
  • Step 4: When the intensity of light is doubled, it means there are now twice as many photons hitting the surface.
  • Step 5: If the frequency of the light is above the threshold frequency, each photon can potentially cause the emission of an electron.
  • Step 6: Since there are more photons (due to increased intensity), more electrons can be emitted from the surface.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient frequency.
  • Intensity and Photons – Intensity is related to the number of photons; doubling intensity means more photons are hitting the surface.
  • Threshold Frequency – The minimum frequency of light required to emit electrons; if the frequency is above this, electrons will be emitted.
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