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5. The light of frequency 8.9 x 10^14 Hz falls on a photoelectric surface. When the...

5. The light of frequency 8.9 x 10^14 Hz falls on a photoelectric surface. When the retarding potential of 0.85 V is applied, the maximum speed with which an electron reaches the collector plate is 4.9 x 10^5 m/s. Find:

a) the maximum kinetic energy( in joules) of an electron as it leaves the photoelectrode

b) the work function (in eV) of the photoelectrode

c) the threshold frequency (in Hz) of the photoelectrode

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