Physics · 2013
JEE Main · 25 April 2013, Shift 1 · Q29
A copper ball of radius 1 cm and work function 4.47 eV is irradiated with ultraviolet radiation of wavelength 2500. The effect of irradiation results…
A copper ball of radius $\displaystyle 1$ cm and work function $\displaystyle 4.47$ eV is irradiated with ultraviolet radiation of wavelength $\displaystyle 2500 \AA$. 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 :
Official answer
(1)
$\displaystyle 5.5 \times 10^{-13} \mathrm{C}$
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.