The ejection of the photoelectron from the silver metal in the photoelectric effect experiment 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.
We know Energy of the incident radiation = Work function + KE of photoelectron Work function = Energy of the incident radiation - KE of photoelectron ..(1).Now energy of the incident radiation (E) = hv
Text Solution Solution : For Balmer series, `n_(1)=2`. Hence, `bar(v)=R(1/2^(2)-1/n_(2)^(2))` <br> `bar(v)=1/lambda`. For `lambda` to be longest (maximum), `bar(v)` should be minimum. This can be so when `n_(2)` is minimum, i.e., `n_(2)=3`. Hence, `bar(v)=(1.097xx10^(7) m^(-1)) (1/2^(2)-1/3^(2))=1.097xx10^(7)xx5/36 m^(-1) =1.523xx10^(6) m^(-1)` Text Solution Solution : For Balmer series ` n_1 =2` <br> If this line possesses longest wavelength <br> ( i.e., lowest energy ) then ` n_2 =3` <br> ` overline (v) = 1/ (lambda) = 109677 [1/2^2 - 1/3^2]` <br> ` = 1. 523 xx 10^4 cm^(-1) = 1. 523 xx 10^6 m^(-1)`. Open in App Suggest Corrections 19 |