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Two monochromatic radiations, blue and vilet, of the same intensity, are incident on a photosensitive surface and cause photoelectric emission. Would (i) the number of electrons emitted per second and (ii) the maximum kinetic energy of the electrons, be equal in the two cases ? Justify your answer. |
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Answer» Solution :Here intensity I of both monochromatic radiations of BLUE and violet colour are EXACTLY the same, but frequency of violet radiations is more than that of blue radiations. Hence (i) The number of electrons emitted per second are equal in two cases because number of photoelectrons depends on the number of incident radiation PHOTONS i.e., the intensity of incident radiation. (II) The maximum kinetic energy of photoelectrons emitted by violet radiation is more because `K_(max)=hv-phi_(0)`, where `phi_(0)` is the work function of given photosensitive surface. |
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