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 Main Online Paper ( Held On 25  April 2013 )

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

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

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

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