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A very slow neutron (with speed approximately equal to zero) can initiate the reaction $$_{0}^{1} \mathrm{n}+_{5}^{10} \mathrm{B} \rightarrow_{3}^{7} \mathrm{Li}+_{...

Question

A very slow neutron (with speed approximately equal to zero) can initiate the reaction $$_{0}^{1} \mathrm{n}+_{5}^{10} \mathrm{B} \rightarrow_{3}^{7} \mathrm{Li}+_{2}^{4} \mathrm{He}$$ The alpha particle moves away with speed $9.25 \times 10^{6} \mathrm{m} / \mathrm{s}$ Calculate the kinetic energy of the lithium nucleus. Use nonrelativistic equations.

A very slow neutron (with speed approximately equal to zero) can initiate the reaction $$_{0}^{1} \mathrm{n}+_{5}^{10} \mathrm{B} \rightarrow_{3}^{7} \mathrm{Li}+_{2}^{4} \mathrm{He}$$ The alpha particle moves away with speed $9.25 \times 10^{6} \mathrm{m} / \mathrm{s}$ Calculate the kinetic energy of the lithium nucleus. Use nonrelativistic equations.



Answers

(II) An alpha particle (which is a helium nucleus, $Q = +2e$ ($m =$ 6.64 $\times$ 10$^{-27}$ ) is emitted in a radioactive decay with $\small\mathrm{KE} =$ 5.53 MeV. What is its speed?


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