alleryStart learning →The kinetic energy of an electron (9 x 10^-31 kg) moving at 3 x 10^7 m/s is
A1.35 x 10^-16 J
B4.05 x 10^-16 J
C4.05 x 10^-14 J
D8.1 x 10^-16 J
Answer & Solution
Correct answer: B. 4.05 x 10^-16 J
KE = 0.5 x 9e-31 x (3e7)^2 = 4.05e-16 J, about 2.5 keV.
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