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Reviewed CSCA Physics question · Easy

The work function of a metal is 2.0 eV. When light of photon energy 3.0 eV shines on it, what is the maximum kinetic energy of the emitted photoelectrons?

  1. 1.0 eV
  2. 2.0 eV
  3. 3.0 eV
  4. 5.0 eV
Show the answer and explanation

Correct answer

A. 1.0 eV

Principle or equation

Photoelectric equation: K_max = hf - W0.

Why this answer is correct

K_max = 3.0 eV - 2.0 eV = 1.0 eV.

Example

If W0 = 2.3 eV and photon energy is 4.0 eV, K_max = 1.7 eV.

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