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Grade 12Modern Physics

a electron of rest mass is 9.11*10^-31kg moves with a speed of 0.8c.What is its kinetic energy

Profile image of Bhuvanesh Kumar
7 Years agoGrade 12
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1 Answer

Profile image of Arun
7 Years ago

rest mass energy is mc^2

where m is rest mass of electron

kinetic energy due to movement will be given as,

[mc^2 / sqrt (1 – v^2 / c^2)] – mc^2

we know v = 0.8c

by putting values,KE = 5.466 * 10^-14 J

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