Question

UV light of 4.13 eV is incident on a photosensitive metal surface having work function 3.13 eV. The maximum kinetic energy of ejected photoelectrons will be :  

(1) 4.13 eV 

(2) 1 eV 

(3) 3.13 eV 

(4) 7.26 eV

Answer 1

Correct option is :  (2) 1 eV  

As we know that 

\((\text{K.E})_{\text{max.}}=\text{hv-work function}\) 

= 4.13eV - 3.13eV 

Max K.E. = 1eV