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Two radiations containing photons of energy twice and five times the work function of a metal are incident successively on the metal surface. The ratio of the maximum velocities of the emitted electrons in the two cases will be: |
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Answer» `1:3` Then `phi_(0)=(1)/(2) mv_(1)^(2)` Also `5phi_(0)=phi_(0)+(1)/(2) mv_(2)^(2)` `:. 4phi_(0)=(1)/(2) mv_(2)^(2)` so `(v_(1)^(2))/(v_(2)^(2))=(phi_(0))/(4phi_(0))=(1)/(4) rArr (V_(1))/(v_(2))=(1)/(2)` |
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