The ejection of the photoelectron from the silver metal in the photoelectric effect exeriment can be stopped by applying the voltage of `0.35 V` when the radiation `256.7 nm` is used. Calculate the work function for silver metal.

Options

A. `4.48ev`
B. `3.35ev`
C. `44.8ev`
D. `22.4ev`

Answer

A

Explanation

`hv = w+ K.E, w = hv - K.E`
`= (hc)/(lambda) - K.E = (6.625 xx 10^(-34) xx 3 xx 10^(8))/(256.7 xx 10^(-9)) - 0.35`