If the frequency of incident light falling on a photosensitive ma… - Vidyadip

MCQ

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will be $........$

A
same as its initial value
B
two times its initial value
✓
more than two times its initial value
D
less than two times its initial value

✓

Answer

Correct option: C.

more than two times its initial value

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will be more than two times its initial value.
$E=W_0+K_{\max }$
$\Rightarrow K_{\max }=E-W_0=h \nu-W_0$
$\Rightarrow K_1=h \nu-W_0$ and $K_2=2 h \nu-W_0$
$\Rightarrow K_2>2 K_1$

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