QJEEAdv19Ph2cbc: JEE Advanced 2019 Physics - Class 12 JEEAdv19Ph2cbc Solution: Suppose a nucleus at rest and in ground state undergoes -decay…

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 $_{86}^{226}Ra$ = 226.005 u, atomic of $_{86}^{222}Rn$ = 222.000 u, atomic mass of $\alpha$ particle = 4.000 u, 1 u = 931 MeV/e², c is speed of the light]