The problem is at
The following equations may be useful
E = .5 mc^2
E = Bev
The Attempt at a Solution
The right answer is (a).
However, I am unsure how it is obtained.
For example, by comparing the energies of the two particles, we get only
(v1 / v2)^2 = (E1 / E2) * 2/167
where the energies are unknown.
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