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Standard XII
Physics
Question

STATEMENT-1 : In photoelectric experiment the ejected electrons have same kinetic energy.
STATEMENT-2 : According to Einstein kinetic energy of every ejected electron is the difference in the energy of a photon and the work function of the metal.
  1. Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
  2. Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
  3. Statement-1 is True, Statement-2 is False
  4. Statement-1 is False, Statement-2 is True.
  5. Statement-1 is False, Statement-2 is False.

A
Statement-1 is False, Statement-2 is False.
B
Statement-1 is True, Statement-2 is False
C
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
D
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
E
Statement-1 is False, Statement-2 is True.
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Solution
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When light of frequency f is incident on a metal surface that has a work function W, the maximum kinetic energy of the emitted electrons is given by:

KEmax=hf−ϕ

Note that this is the maximum possible kinetic energy because ϕ is the minimum energy necessary to liberate an electron.Increasing the frequency of the incident beam, keeping the number of incident photons fixed increases the maximum kinetic energy of the photoelectrons emitted.So, Statement-1 is False, Statement-2 is False.

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