Suppose a ._(88)^(226)Ra nucleus at rest and in ground state undergoes alpha- decay to a ._(86)^(222)Rn nucleus in its excited state. The kinetic energy of the emitted alpha particle is found to be 4.44 MeV. ._(86)^(222)Rn nucleus then goes to its ground state by gamma-decay. The energy of the emitted gamma photon is ___keV. [Given: atomic mass of ._(88)^(222)Ra = 226.005u. atomic mass of222/86Rn = 222.000u, atomic mass of alpha particle = 4.000 u, 1 u =931 MeV//c^2, c is speed of the light].

Suppose a ._(88)^(226)Ra nucleus at rest and in ground state undergoes

1.	Suppose a ._(88)^(226)Ra nucleus at rest and in ground state undergoes alpha- decay to a ._(86)^(222)Rn nucleus in its excited state. The kinetic energy of the emitted alpha particle is found to be 4.44 MeV. ._(86)^(222)Rn nucleus then goes to its ground state by gamma-decay. The energy of the emitted gamma photon is ___keV. [Given: atomic mass of ._(88)^(222)Ra = 226.005u. atomic mass of222/86Rn = 222.000u, atomic mass of alpha particle = 4.000 u, 1 u =931 MeV//c^2, c is speed of the light].
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