Question

Given in fig. is the graph between frequency v of the incident light and maximum kinetiec energy `(E_(k))` of the emitted photoelectrons. Find the values of (i) threshold frequency and (ii) work function form the graph.

Answer 1

Correct Answer - `(i) 10^(15)Hz (ii) 4eV`
(i) Threshold frequency ,
`v_(0)=10xx10^(14)Hz =10^(15)Hz`
(ii) At, `v=0, E_(k)=hxx0-phi_(0)=-phi_(0)`
or `phi_(0)=-E_(k)=-(-4eV)=4eV`