Question

a photosensitive surface emits photelectrons when red light falls on it. Will the surface photoelectrons when blue light is incident on it. Give reason.

Answer 1

Dear student
$$\begin{gathered} photoemissiontakesplacewhenredlightisincidentmeans \\ \frac{hc}{{\lambda }_{red}}>Workfunction..1 \\ Whenbluecolourlightisincidentthenenergyimpartedtotheelectronis \\ E=\frac{hc}{{\lambda }_{blue}} \\ as{\lambda }_{red}>{\lambda }_{blue} \\ so\frac{hc}{{\lambda }_{blue}}>\frac{hc}{{\lambda }_{red}}...2 \\ fromrelation1and2 \\ \frac{hc}{{\lambda }_{blue}}>W \\ sophotoelectronwillbeemittedwhenbluelightisincident. \\ Regards \end{gathered}$$