A nucleus with mass number 220 initially at rest emits an α -particle. If the Q value of the reaction is 5.5 MeV, then the kinetic energy of the α -particle is
Given that K1+K2=5.5 MeV
From Conservation of Linear Momentum,
Solving equations (1) and (2), we get K2=KE of α - particle = 5.4 MeV.