- #1
JonNash
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Homework Statement
For an electron having energy 1.5MeV/c (mass of an electron is 0.5MeV), the velocity is given by?
a) 2.92x1010 cm/sec
b) 2.81x1010 cm/sec
c) 2.75x1010 cm/sec
d) 2.50x1010 cm/sec
Homework Equations
Kinetic Energy = 0.5mv2
The Attempt at a Solution
I first converted energy into joules and mass into kg. E=2.4032x10-13 and mass = 8.91331x10-31. Then I put it into the equation for kinetic energy and solved for v which yields the result v = 7.3432x1010 cm/s which is not among the choices. Then I observed that energy is not given in simply eV, at the end there is MeV/c. I am unable to understand what this means. It would unbalance the units on RHS. Is there another formula to be used instead of KE and what does MeV/c mean?