A silver balll is suspended by a string in a vacuum chamber and ultraviolet light of wavelength `2000 Å` is directed at it. What electrical potential will the ball acquire as a result? Work function of silver is 4.3 eV.

Answer

A

Explanation

`K_(max) (in eV) = E -W`
`= (12375)/(2000) - 4.3`
=1.9 eV
Therefore, stopping potentia is 1.9 V.