A gas of helium atoms (each of mass 6.65 × 10-27 kg) are at room temperature of 20.0°C. What is the de Broglie wavelength of the helium atoms that are moving at the root-mean-square speed?
(h = 6.626 × 10-34 J • s, the Boltzmann constant is 1.38 × 10-23 J/K)
A) 5.22 × 10-11 m
B) 7.38 × 10-11 m
C) 1.04 × 10-10 m
D) 2.82 × 10-10 m
E) 3.99 × 10-10 m
B
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