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

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

Options:

  1. It decreases
  2. It remains constant
  3. It increases
  4. It becomes negative

Correct Answer: It increases

Solution: 

The kinetic energy of the emitted electrons increases with the frequency of the incident light, as given by the equation KE = hf - Ο†, where Ο† is the work function.

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

Practice Questions

Q1
In the photoelectric effect, what happens to the kinetic energy of the emitted electrons if the frequency of the incident light is increased?
  1. It decreases
  2. It remains constant
  3. It increases
  4. It becomes negative

Questions & Step-by-Step Solutions

In the photoelectric effect, what happens to the kinetic energy of the emitted electrons if the frequency of the incident light is increased?
Correct Answer: Kinetic energy increases.
  • Step 1: Understand the photoelectric effect. This is when light hits a material and causes it to emit electrons.
  • Step 2: Know that light can be thought of as made up of particles called photons.
  • Step 3: Each photon has energy that depends on its frequency (how fast the light waves oscillate). The energy of a photon is given by the formula E = hf, where h is Planck's constant and f is the frequency of the light.
  • Step 4: When light hits the material, if the energy of the photons is greater than a certain threshold (called the work function, Ο†), electrons are emitted.
  • Step 5: The kinetic energy (KE) of the emitted electrons can be calculated using the formula KE = hf - Ο†.
  • Step 6: If the frequency (f) of the incident light increases, the energy (hf) of the photons also increases.
  • Step 7: Since Ο† (the work function) is a constant for a given material, an increase in hf means that KE (the kinetic energy of the emitted electrons) will also increase.
  • 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 is influenced by the frequency of the incident light and the work function of the material.
  • Work Function (Ο†) – The minimum energy required to remove an electron from the surface of a material.
  • Planck's Equation – The relationship between the energy of a photon and its frequency, expressed as E = hf, where h is Planck's constant.
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