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27. A silver ball of radius 4.8 cm is suspended by a thread
in a vacuum chamber. Ultraviolet light of wavelength
200 nm is incident on the ball for some time during
which a total light energy of 1:0 x 10-J falls on the
surface. Assuming that on the average one photon out
of every ten thousand is able to eject a photoelectron,
find the electric potential at the surface of the ball
assuming zero potential at infinity. What is the potential
at the centre of the ball ?


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