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JEE Main 2013 — Physics Modern Physics
A copper ball of radius 1 cm and work function 4.47 eV is irradiated with ultraviolet radiation of wavelength 2500 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 :
Held on 25 Apr 2013 · Verified 6 Jul 2026.
5.5×10−13 C
7.5×10−13 C
4.5×10−12 C
2.5×10−11 C
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