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A silver ball of radius 4.8 cn is suspen...

A silver ball of radius 4.8 cn is suspended by a thread in a cacuum chamber, Ultraviolet light of wavelength 200nm is incident on the ball for some time during which a total light energy of ` 1.0 xx (10^-7)` 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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