Sodium and copper have work functions of...

Sodium and copper have work functions of 2.3 eV and 4.6 eV respectively. The ratio of their threshold wavelengths is

A

`1:2`

B

`2:1`

C

`1:4`

D

`4:1`

Text Solution

Verified by Experts

The correct Answer is:

B

Since `phi_(0)=(hc)/(lamda_(0))`, hence `=((lamda_(0))_(Na))/((lamda_(0))_(Cu))=((phi_(0))_(Cu))/((phi_(0))_(Na))=(4.6)/(2.3)=2:1`.

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