InterviewSolution
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InterviewSolution
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` H^(+), He^(+) and O^(++)` all having the same kinetic energy pass through a region in which there is a uniform magnetic field perpendicular to their velocity . The masses of ` H^(+), He^(+) and O^(2+)` are `1 amu, 4 amu and 16 amu` respectively . ThenA. `H^+` will be deflected mostB. `O^(2+)` will be deflected mostC. `He^+` and `O^(2+)` will be deflected equallyD. all will be deflected equally |
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Answer» Correct Answer - A::C (c) As `r=(mv)/(qB)` and `K=1/2mv^2`, `r=(sqrt(2mK))/(qB)` i.e., `rpropsqrtm/q` [for same K and B] `r_(H+)propsqrt1/1` and `r_(O^(2+))` are equal, So `He^+` and `O^(2+)` will be deflected equally. (a) Since `(r_(H^+))/(r_(He^+))=(sqrt1//1)/(sqrt4//1)=1/2`, `r_(H^+)=1/2He^+=1/2r_(O^(2+))` `H^+` will be deflected most. |
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