Photoelectrons are ejected from a metal when light of frequency $v$ falls on it. Pick out the wrong…

Photoelectrons are ejected from a metal when light of frequency $v$ falls on it. Pick out the wrong statement from the following.
  1. No electrons are emitted if $v$ is less than $W / h$, where $W$ is the work function of the metal
  2. The ejection of the photoelectrons is instantaneous.
  3. The maximum energy of the photoelectrons is hu.
  4. The maximum energy of the photoelectrons is independent of the intensity of the light.

Solution

According to photo-electric equation : $\mathrm{K} . \mathrm{E}_{\max }=\mathrm{h} v-\mathrm{h} v_0$ (Work function) Some sort of energy is used in ejecting the photoelectrons.

Asked in: JEE Main 2012 (26 May Online)

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