A beam of light of wavelength 400 nm and power 1.55 mW is directed at the cathode of a photoelectric cell. If only 10% of the incident photons effectively produce photoelectrons, find the current due

Question

A beam of light of wavelength 400 nm and power 1.55 mW is directed at the cathode of a photoelectric cell. If only 10% of the incident photons effectively produce photoelectrons, find the current due to these electrons (in μ A ) : ( Take hc = 1240 eV nm )

TestHub · Accepted Answer

Energy of light of wave length 400 nm = 3.1 eV Let photon incident per unit time = n n × 3.1 eV = 1.55 mW = Power = energy per unit time

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