Physics - Modern Physics Question with Solution | TestHub

A copper ball of radius $1\mathrm{cm}$ and work function $4.47\mathrm{eV}$ 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 :