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Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. |
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Answer» Solution :Experimentally observed features in the phonomenon of photoelectric effect are as follows: (i) For a given metal and frequency of incident radiation (above the THRESHOLD frequency), the number of photoelectrons emitted per second is DIRECTLY proportional to the INTENSITY of incident light. (ii) For a given metal, there exists a certain minimum frequency (threshold frequency) of incident radiation, below which no emission of photoelectrons takes PLACE. (iii) Above the threshold frequency, the maximum kinetic energy of emitted photoelectrons is directly proportional to the frequency of incident radiation but is independent of the intensity of the intensity of incident radiation. Moreover, photoelectric emission is an instantaneous process without anytime `lag(~10^(-9)s` or even less), even when the incident radiation is very DIM. |
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