InterviewSolution
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InterviewSolution
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A physicist was performing experiments to study the effect of varying voltage on the velocity and wavelength of the electrons. In one case, the electron was accelerated through a potential difference of 1kV and in the second case, it was accelerated through a potential difference of 2kV The velocity acquired by the electron will beA. double in the second case than in the first caseB. four times in the second case than in the first caseC. same in both casesD. 1.4 times in the second case than in the first case |
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Answer» Correct Answer - D K.E. of the electron in case `I = 1000 eV` `= 1000 xx 1.602 xx 10^(-16) J = 1.602 xx 10^(-16)J` K.E. of the electron in case II = 2000 eV `= 2 xx 1.602 xx 10^(-16) J` `:. ((1)/(2) mv_(2)^(2))//((1)/(2) mv_(1)^(2)) = 2 or (v_(2)//v_(1))^(2) = 2` or `v_(2)//v_(1) = sqrt2 = 1.4` |
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