The free resting nucleus of iridium-131 passes from the excited state with energy E = 129 keV to the ground state, emitting a g-quantum. Find the energy of the emitted g-quantum Eg and the recoil energy R of the nucleus. Calculate the change in the energy of the emitted quantum in the case when the nucleus is located in a crystal lattice with mass Mk = 1 g, which completely absorbs the recoil impulse of the nucleus (Mossbauer effect).
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