1.

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be :A. `2700Å`B. `1700Å`C. `5900Å`D. `3100Å`

Answer» Correct Answer - D
The work function for a metal ……….
`E_(ev) = (12400eV-Å)/(lambda Å)`


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