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….

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Q. 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 (in MeV)

(a) 4.4

(b) 5.4

(c) 5.6

(d) 6.5

Ans: (b)

Sol: E = P2/2m

As, P = constant

mE = constant

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