InterviewSolution
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InterviewSolution
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Assuming photoemission to take place , the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times , isA. `4`B. `(1)/(4)`C. `2`D. `(1)/(2)` |
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Answer» Correct Answer - D `(hc )/(lambda) = W_(0) + (1)/(2) mv_(max)^(2)`. Assuming `W_(0)` to be negligible in comparison to `(hc )/(lambda)` i.e., `v_(max)^(2) prop (1)/(lambda) rArr v_(max) prop (1)/(sqrt(lambda))`. (On increasing wavelength `lambda to 4 lambda , v_(max)` becomes half). |
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