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Worksheet: The Photoelectric Effect

Q1:

For atoms of aluminum, the photoelectric effect is not observed if the incoming light has a frequency less than 9 . 8 7 × 1 0 1 4 Hz. Calculate the threshold energy for ejecting an electron from the aluminum atom.

  • A 408 kJ/mol
  • B 654 kJ/mol
  • C 304 kJ/mol
  • D 394 kJ/mol
  • E 245 kJ/mol

Q2:

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

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

Q3:

A photon with a frequency of 6 . 6 6 × 1 0 1 4 Hz ejects an electron from a sodium atom. The ejected electron has a kinetic energy of 7 . 7 4 × 1 0 2 0 J. Calculate the minimum frequency of light that could eject an electron from a sodium atom.

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