An α - particle collides with a stationary lithium, as 4He+7Li→10B+n . If Q value of this reaction is Q=−2.5MeV. Find the minimum value of kinetic energy of α- particle required for the reaction?
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a
4.42 MeV
b
1.52 MeV
c
2.92 MeV
d
3.92 MeV
answer is D.
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Detailed Solution
Threshold energy =Eth=−Q1+AαALi=−−2.51+47MeV ⇒Eth=3.92MeV