JEE Advanced 2011 Physics question
A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free-space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere is (where 1 < A < 10). The value of 'Z' is
Answer: 7
Solution
Photon energy eV, so the maximum kinetic energy of photoelectrons is eV. As electrons leave, the sphere becomes positively charged; emission stops when its potential reaches the stopping
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