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An electron moving at 3 × 10^7 m/s has a kinetic energy of about
A0.25 keV
B25 keV
C2.5 keV
D250 keV
Answer & Solution
Correct answer: C. 2.5 keV
KE = half of 9 × 10^-31 kg times (3 × 10^7)^2 is about 4 × 10^-16 J, which is 2.5 keV.
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