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Threshold wavelength of tungsten is 2300 angstrom. If ultraviolet light of wavelength 1800 angstrom is incident on it, then the maximum kinetic energy of photoelectrons would be?

1. 1.5 ev
2. 2.5ev
3. 3.0 ev
4. \( 5.0 \mathrm{eV} \)

Correct answer: 2.5ev

Solution

The threshold wavelength gives the work function of tungsten, and the incident ultraviolet light has higher photon energy because its wavelength is shorter. The maximum kinetic energy is the difference between incident photon energy and work function, which comes out to 2.5 eV.

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