First slide

Photo Electric Effect

Question

Let $K_{1}$ be the maximum kinetic energy of photoelectrons emitted by light of wavelength $λ_{1}$ and $k_{2}$ corresponding to wavelength $λ_{2}$ . If $λ_{1} = 2 λ_{2}$ then :

Moderate

A

$2 K_{1} = K_{2}$
B

$K_{1} = 2 K_{2}$
C

$K_{1} < \frac{K_{2}}{2}$
D

$K_{1} > 2 K_{2}$

Solution

$g i v e n λ_{2} = \frac{λ_{1}}{2} f r e q u e n c y f_{2} = 2 f_{1} s o i f f r e q u e n c y b e c o m e s d o u b l e k i n e t i c e n e r g y b e c o m e s m o r e t h a n d o u b l e$

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