A He-Ne laser has a gas discharge temperature of 400 k. The atomic mass of Ne (which is responsible for lasing) is 3.35*10^-26 kg. if lasing wavelength is 630 nm, calculate the lineshape broadening due to doppler effect. * solve this question again baring in mind that the result is lambda = 0.002 nm , so the shift is 630 nm +/- 0.002 nm

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