Quiz  /  MCQ On Photoelectric Effect

  • 1. 
    Photoelectric effect was explained by

  • Einstein
  • Faraday
  • Plank
  • Hertz

  • 2. 
    In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be

  • 2 V
  • Less than 2 V
  • Zero
  • Greater than 2 V

  • 3. 
    Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wavelength of photo-electrons is 5420 Å. The work function of sodium is

  • 5 eV
  • 3 eV
  • 2.29 eV
  • 0.57 eV

  • 4. 
    Photocell is a device to

  • Store photons
  • Measure light intensity
  • Convert photon energy into mechanical energy
  • Store electrical energy for replacing storage batteries

  • 5. 
    Photoelectrons stopping potential depends on

  • Frequency of incident light and nature of the cathode material
  • The intensity of the incident light
  • The frequency of the incident light
  • Nature of cathode material

  • 6. 
    What is the value of the maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm?

  • 12 eV
  • 6.2 eV
  • 100 eV
  • 300 eV

  • 7. 
    The stopping potential value is 0.6 V when the light source is kept at a distance of 20 cm. When the source is kept at 40 cm away, the stopping potential will be

  • 0.6 V
  • 0.3 V
  • 1.2 V
  • 2.4 V

  • 8. 
    A photocell is receiving light from a source placed at a distance of 1m. If the same source is to be placed at a distance of 2 m, then the ejected electron

  • 2.1 x 10
  • J
  • 8.5 x 10
  • J
  • 5.3 x 10
  • J
  • 3.2 x 10
  • J

  • 9. 
    The minimum energy required to remove an electron is called

  • Moves in one-fourth energy as that of the initial energy
  • Moves with one-fourth momentum as that of the initial momentum
  • Will be half in number
  • Will be one-fourth in number
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