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Question

The work function of a metal is hv0. Light of frequency v falls on this metal. The photoelectric effect will take place only if


  1. ν ≥ ν0

  2. ν > 2ν0

  3. ν < ν0  

  4. ν < ν0/2


Solution

The correct option is A

ν ≥ ν0


The work function of the metal is W=hv0. For photoelectrons to get ejected we will need to throw photons carrying energy greater than the work function W. The light shone has frequency ν.

For photoelectric effect,

EphotonW

hνhν0

νν0.

Therefore, (a) is the correct choice!

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