Q.

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
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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?