A nucleus of mass M at rest, is initially in an excited state whose energy is ΔE above the ground state of the nucleus. The nucleus emits a gamma ray of energy hv and makes a transition to ground state. Now choose CORRECT statement(s)
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a
The nucleus will recoil when it emits a γ−ray because of the conservation of linear momentum
b
The nucleus will not recoil when it emits a γ−ray because of the conservation of linear momentum is not obeyed in such type of processes
c
The value of hv is less than ΔE
d
The value of hv is greater than ΔE
answer is A.
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Detailed Solution
Conservation of linear momentum is always obeyed in absence of external forces. So due to recoil of nucleus hv will be less than ΔE .