First slide

Photo Electric Effect

Question

The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

Moderate

A

Double the earlier value
B

Unchanged
C

More than doubled
D

Less than doubled

Solution

$\begin{array}{l} E = W_{o} + K_{\max} \Rightarrow K_{\max} = E - W_{o} = hv - W_{o} \\ \Rightarrow K_{1} = hv - W_{o} and K_{2} = 2 hv - W_{o} \Rightarrow K_{2} > 2 K_{1} \end{array}$

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