The natural linewidth of the first excited state with an energy of 22.4 keV for the 119Sn nucleus is DE = 3•10-8 eV. What should be the speed of the source relative to the absorber so that when observing the Mössbauer effect, the counting intensity of transmitted g-quanta is halved? Assume that the source and absorber nuclei are in identical conditions and at the same temperature, i.e. the maximum intensity corresponds to zero speed.

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