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.
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