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What happens to the number of emitted electrons if the intensity of the light is

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Question: What happens to the number of emitted electrons if the intensity of the light is increased while keeping the frequency above the threshold?

Options:

  1. The number of emitted electrons decreases
  2. The number of emitted electrons increases
  3. The energy of each emitted electron increases
  4. No effect on the number of emitted electrons

Correct Answer: The number of emitted electrons increases

Solution: 

Increasing the intensity of light increases the number of photons, which in turn increases the number of emitted electrons, provided the frequency is above the threshold.

What happens to the number of emitted electrons if the intensity of the light is

Practice Questions

Q1
What happens to the number of emitted electrons if the intensity of the light is increased while keeping the frequency above the threshold?
  1. The number of emitted electrons decreases
  2. The number of emitted electrons increases
  3. The energy of each emitted electron increases
  4. No effect on the number of emitted electrons

Questions & Step-by-Step Solutions

What happens to the number of emitted electrons if the intensity of the light is increased while keeping the frequency above the threshold?
  • Step 1: Understand that light is made up of tiny particles called photons.
  • Step 2: Know that each photon can knock out one electron from a material if the light's frequency is high enough (above the threshold).
  • Step 3: Realize that increasing the intensity of light means you are increasing the number of photons hitting the material.
  • Step 4: Since each photon can potentially emit one electron, more photons mean more chances to emit electrons.
  • Step 5: Conclude that if the frequency is above the threshold, increasing the intensity will lead to more 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 directly related to the number of photons; increasing intensity increases the number of photons hitting the surface.
  • Threshold Frequency – The minimum frequency of light required to emit electrons; if the frequency is above this threshold, electrons can be emitted.
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