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A gas of helium atoms (each of mass 6.65×10−27kg) is at room temperature of 7.1°C. What...

A gas of helium atoms (each of mass 6.65×10−27kg) is at room temperature of 7.1°C. What is the de Broglie wavelength of the helium atoms that are moving at the root-mean-square speed?

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Answer #1

Concept - use equation for rms speed at a given temperature from kinetic theory of gases and use the speed to find momentum and hence the de Broglie wavelength,

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