First slide

Photo Electric Effect

Question

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of their threshold wavelengths is nearest to

Easy

A

1 : 2
B

4 : 1
C

2 : 1
D

1 : 4

Solution

$W_{o} \propto \frac{1}{λ} \Rightarrow \frac{λ_{1}}{λ_{2}} = \frac{{(W_{o})}_{2}}{{(W_{o})}_{1}} = \frac{4 .5}{2 .3} = \frac{2}{1} .$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App