Posted by **Monique** on Monday, April 16, 2012 at 2:53pm.

an electron has a kinetic energy that is 1.8 times its rest energy. What is its speed, expressed as a fraction of the speed of light?

- physics -
**Elena**, Monday, April 16, 2012 at 3:39pm
m•c^2 = 1.8•m(o) •c^2,

m(o) •c^2/sqrt(1- β^2) = 1.8•m(o) •c^2,

sqrt(1- β^2) =1/1.8

β = 0.831

β = v/c ,

v = 0.831c = 2.49•10^8 m/s

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