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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

`5893 A`

B

`10683 A`

C

`2791 A`

D

`528 A`

Text Solution

Verified by Experts

The correct Answer is:
C
`phi_0=hupsilon_0=(hc)/(lamda_0)`
`phi_0lamda_0=constant`
`4.5xxlamda=2.3xx5460`
or `lamda=(2.3xx5360)/(4.5)A=2790A approx2791A`
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