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Q.1. When light from a hydrogen discharge tube is examined, it is found that each spectral line is spread over a small range of wavelengths. The reason for this is most likely to be
(a) Doppler effect, as the gas atoms emitting light are in motion
(b) the recoil of an atom when it emits a photon
(c) the collision of photons with free electrons before they emerge from the tube
(d) that the energy levels in an excited atom are actually slightly different from the values predicted bt Boh's theory
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