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Question

Ratio of masses of electrons moving with a velocity 0.9 times of speed of light and 0.8 times of speed of light respectively are:
  1. 1936
  2. 6481
  3. 8164
  4. 3619

A
6481
B
1936
C
3619
D
8164
Solution
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As we know,
me=m[[1(uec)2]]1/2
me=mc[c2u2]1/2

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