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Photoelectric effect takes place in elem...

Photoelectric effect takes place in element A. Its work funcation is `2.5 eV` and threshold wavelength is `lambda`. An other element B is having work function of `5 eV`. Then find out the wavelength that can produce photoelectric effect in B.

A

`lambda//2`

B

`2lambda`

C

`lambda`

D

`3lambda`

Text Solution

Verified by Experts

The correct Answer is:
A
`(phi_(1))/(phi_(2)) = (lambda_(2))/(lambda_(1))`
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