question_answer

A copper ball of radius 1 cm and work function 4.47 eV us irradiated with ultraviolet radiation of wavelength\[2500{{\operatorname{A}}_{\circ }}\]. The effect of irradiation results in the emission of electrons form the ball. Further the ball will acquire charge and due to this there will be a finite value of the potential on the ball. The charge acquired by the ball is:                                                                    [JEE ONLINE 25-04-2013]

A)             \[5.5\times {{10}^{-13}}C\]

B)             \[7.5\times {{10}^{-13}}C\]

C)              \[4.5\times {{10}^{-12}}C\]

D)             \[2.5\times {{10}^{-11}}C\]