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In the set-up of the previous question, an electron E moves from X to Y and a proton P moves from Y to Z. Both particles start from rest. (a) E reaches Y with greater energy than P. (b) P reaches Y with greater energy than E. (c) P and E reach Y with equal energies. (d) P reaches Y with greater momentum than E. |
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Answer» Correct Answer is: (c, d) The two particles have equal charges and move through the same p.d. They will, therefore, acquire the same energy (E). Also, E = p 2/ 2m or p = √(2mE), where p = momentum. For the same E, the particle with greater m has greater p. |
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