question_answer

When radiations of wavelength \[3000\overset{\text{o}}{\mathop{\text{A}}}\,\] are incident on a photosensitive surface, the kinetic energy of electrons is\[2.5\text{ }eV\]. The stopping potential for radiations of wavelength \[1500\overset{\text{o}}{\mathop{\text{A}}}\,\] will be :-

A)  \[{{V}_{s}}=2.5\,V\]

B)  \[{{V}_{s}}=5.0\,V\]

C)  \[2.5\le {{V}_{s}}\le 5.0V\]

D)  \[{{V}_{s}}>5.0V\]