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In the photoelectric effect, what is the effect of increasing the wavelength of

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Question: In the photoelectric effect, what is the effect of increasing the wavelength of incident light?

Options:

  1. Increases the kinetic energy of emitted electrons
  2. Decreases the kinetic energy of emitted electrons
  3. Has no effect on the photoelectric effect
  4. Increases the number of emitted electrons

Correct Answer: Decreases the kinetic energy of emitted electrons

Solution: 

Increasing the wavelength decreases the frequency of the light, which reduces the energy of the incident photons, thus decreasing the kinetic energy of emitted electrons.

In the photoelectric effect, what is the effect of increasing the wavelength of

Practice Questions

Q1
In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
  1. Increases the kinetic energy of emitted electrons
  2. Decreases the kinetic energy of emitted electrons
  3. Has no effect on the photoelectric effect
  4. Increases the number of emitted electrons

Questions & Step-by-Step Solutions

In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
  • Step 1: Understand that light can be thought of as made up of tiny packets of energy called photons.
  • Step 2: Know that the energy of a photon is related to its frequency and wavelength. The formula is: Energy = Frequency x Planck's constant.
  • Step 3: Recognize that wavelength and frequency are inversely related. This means that if you increase the wavelength, the frequency decreases.
  • Step 4: Since energy is directly related to frequency, if the frequency decreases, the energy of the photons also decreases.
  • Step 5: In the photoelectric effect, when the energy of the incident photons decreases, the kinetic energy of the emitted electrons also decreases.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient energy.
  • Wavelength and Frequency Relationship – Wavelength and frequency are inversely related; as one increases, the other decreases.
  • Photon Energy – The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength.
  • Kinetic Energy of Electrons – The kinetic energy of emitted electrons is determined by the energy of the incident photons minus the work function of the material.
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