question_answer

A light of wavelength \[2000\,\overset{\text{o}}{\mathop{\text{A}}}\,\] falls on a metallic surface of work function 5.01 eV then required potential difference to slope fastest photo electron is : \[(h=6.62\times {{10}^{-34}})\]

A)  4.8V      

B)                         3.6V                     

C)  2.4V                     

D)         1.2V