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A source emits monochromatic light of fr...

A source emits monochromatic light of frequency `5.5xx10^(14)` Hzat a rate of 0.1 W. Of the photons given out, 0.15% fall on the cathode of a photocell which gives a current of `6muA` in an extrnal circuit.
(a) Find the enrgy of a photon.
(b) Find the number of photons leaving the source per second.
(C) Find the percentage of the photons falling on the cathode which produce photoelectrons.

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