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A cloud of gas has a temperature of 5,000 K.

Estimate the width of the hydrogen H-alpha line with an intrinsic wavelength λ = 656 nm.

(Note: the typical velocity of hydrogen atoms in a gas with temperature T is about (kT/m_H)^1/2, where k is Boltzmann constant and m_His the mass of a hydrogen atom, which is approximately the mass of a proton).

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