Worksheet: The Photoelectric Effect

In this worksheet, we will practice defining the photoelectric effect and determining the work function of an atom or surface from the electron kinetic energy.

Q1:

Which of the following descriptions of the photoelectric effect is true?

  • AIncreasing the frequency of incoming light increases the kinetic energy of electrons ejected.
  • BIncreasing the frequency of incoming light decreases the kinetic energy of electrons ejected.
  • CIncreasing the wavelength of incoming light increases the kinetic energy of electrons ejected.
  • DIncreasing the brightness of incoming light can decrease the number of electrons ejected.
  • EIncreasing the brightness of incoming light increases the kinetic energy of electrons ejected.

Q2:

For atoms of aluminum, the photoelectric effect is not observed if the incoming light has a frequency less than 9.87×10 Hz. Calculate the threshold energy for ejecting an electron from the aluminum atom.

Q3:

A photon with a frequency of 6.66×10 Hz ejects an electron from a sodium atom. The electron ejected has a kinetic energy of 7.74×10 J. Calculate the minimum frequency of light that could eject an electron from a sodium atom.

  • A5.49×10 Hz
  • B3.64×10 Hz
  • C4.98×10 Hz
  • D7.83×10 Hz
  • E4.30×10 Hz

Q4:

Which of the following is a phenomenon that demonstrates the particle nature of light?

  • ALight diffraction
  • BDiffraction
  • CInterference effects
  • DColor
  • EThe photoelectric effect

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