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Red light however bright it is,cannot produce the emission of electrons from a clean zinc surface , but even weak ultraviolet radiation can do so, why ? |
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Answer» Solution :(i) The photoemission of electron does not depend on the intensity but it depends on the frequency and HENCE on the energy of photon of incident light. (ii) If the energy of photon is GREATER than the WORK function, the photoemission of electrons results however weak the incident radiation MAY be. (iii) The energy of photon of red light is less than the work functionof zinc, so red light cannot emit photoelectrons. (iv) The energy of photon of ultraviolet light is greater than the work function of zinc, so ultraviolet light can emit photoelectrons. |
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