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Photoelectric effect takes place in elem...

Photoelectric effect takes place in element A. Its work function 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

` lamda//2 `

B

`2 lamda `

C

`lamda `

D

` 3 lamda `

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The correct Answer is:
A
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  • The work function of a metal is 4.2 eV , its threshold wavelength will be

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