Questions
A nucleus with mass number 220 initially at rest emits an -particle. If the Q-value of the reaction is 5.5 MeV, the kinetic energy of the -particle is
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a
4.4MeV
b
5.4MeV
c
2.75MeV
d
6.5MeV
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Correct option is B
Let K1 & K2 and P1 & P2 are the K.E and momentum of the α-particle and remaining nucleus, then K1+K2=5.5MeV--- (i)From conservation of linear momentum P1=P2 ⇒2K1×4m=2K2×216m⇒K1=54K2 --- (ii)From (i) and (ii) K1=5.5×5455=5.4MeVSimilar Questions
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