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.

  • A304 kJ/mol
  • B408 kJ/mol
  • C654 kJ/mol
  • D245 kJ/mol
  • E394 kJ/mol

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.

  • A 5 . 4 9 × 1 0 Hz
  • B 3 . 6 4 × 1 0 Hz
  • C 4 . 9 8 × 1 0 Hz
  • D 7 . 8 3 × 1 0 Hz
  • E 4 . 3 0 × 1 0 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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