alleryStart learning →What is the rms speed of helium atoms (mass 4u) at 300 K, to the nearest 10 m/s?
A1370 m/s
B517 m/s
C683 m/s
D2740 m/s
Answer & Solution
Correct answer: A. 1370 m/s
v^2 = 3 kB T/m = 3(1.38e-23)(300)/(4 x 1.66e-27) = 1.87e6, so vrms is about 1368 m/s.
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