Question

A copper ball of radius 1 cm and work function 4.47 eV is irradiated with ultraviolet radiation of wavelength 2500 $\mathring{A}$. The effect of irradiation results in the emission of electrons from 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:

• A. $5.5\times {10}^{-13}C$
• B. $7.5\times {10}^{-13}C$
• C. $4.5\times {10}^{-12}C$
• D. $2.5\times {10}^{-11}C$

Answer 1

The correct option is A $5.5\times {10}^{-13}C$

Option A is correct.