A source emits monochromatic light of frequency 5.0 × 1014 Hz at a rate of 0.20W. Of the photons given out, 0.25% falls on the cathode of photocell which gives a current of 9.0µA in an external circuit. You may assume this current consists of all the photoelectrons emitted. Calculate: (i.) the energy of a photon, (ii.) the number of photons leaving the source per second, (iii.) the percentage of photons falling on the cathode which produce photoelectrons.
A source emits monochromatic light of frequency 5.0 × 1014 Hz at a rate of 0.20W. Of the photons given out, 0.25% falls on the cathode of photocell which gives a current of 9.0µA in an external circuit. You may assume this current consists of all the photoelectrons emitted. Calculate: (i.) the energy of a photon, (ii.) the number of photons leaving the source per second, (iii.) the percentage of photons falling on the cathode which produce photoelectrons.
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A source emits monochromatic light of frequency 5.0 × 1014 Hz at a rate of 0.20W. Of the photons given out, 0.25% falls on the cathode of photocell which gives a current of 9.0µA in an external circuit. You may assume this current consists of all the photoelectrons emitted. Calculate:
(i.) the energy of a photon,
(ii.) the number of photons leaving the source per second,
(iii.) the percentage of photons falling on the cathode which produce photoelectrons.
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