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A photoelectric surface is illuminated successively by monochromatic ligth of wavelength lambda and (lambda)/(2). If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function at the surface of material is........................ |
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Answer» `(hc)/(lambda)` `3KE_(1) = (2hc)/(lambda) - phi` `KE_(1) = (2hc)/(3 lambda) - (phi)/(3)""…(2)` Equating (1) and (2) `(hc)/(lambda) - phi""= (2hc)/(3 lambda) - (phi)/(3)` `(hc)/(3 lambda) = (2 phi)/(3) RARR phi = (hc)/(2 lambda)` |
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