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The work function for tungsten and sodiu...

The work function for tungsten and sodium are `4.5 eV` and `2.3 eV` respectively . If the threshold wavelength `lambda` for sodium is `5460 Å`, the value of `lambda` for tungsten is

A

`528 Å`

B

`2791 Å`

C

`5893 Å`

D

`10683 Å`

Text Solution

Verified by Experts

The correct Answer is:
B
Since , `phi_(0) = (hc)/(lamda_0) , ` so `phi_(0_r)/phi_(0_(Na))=lamda_(Na)/(lamda_T)` or `lamda_T = lamda_(Na) xx(phi_(0_(Na)))/(phi_(0_(r)))=(5460xx2.3)/(4.5)=2791Å`
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