A Gas of Helium Atoms (Each of Mass 6

question 52

Multiple Choice

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

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