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1.11 Calculate the Doppler width of a spectrum line from a neon
discharge tube operating at a temperature of 100°C. The value
of the Boltzmann constant k is 1.38 x 10-23 joules per degree
Kelvin (J/K) and the mass of the neon atom is 3.34 x 10-26 kg.
Take A = 600 nm and find the line width in both frequency and
wavelength.

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