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(B) In the fission of ${ }_{92}^{235} U$,the neutrons produced are fast neutrons.These neutrons have a kinetic energy distribution,but their average e

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$320 	imes 10^{-15} \,J$

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(B) In the fission of ${ }_{92}^{235} U$,the neutrons produced are fast neutrons.These neutrons have a kinetic energy distribution,but their average energy is approximately $2 \,MeV$.We know that $1 \,eV = 1.6 	imes 10^{-19} \,J$.Therefore,$2 \,MeV = 2 	imes 10^6 	imes 1.6 	imes 10^{-19} \,J$.$2 \,MeV = 3.2 	imes 10^{-13} \,J$.This can be written as $320 	imes 10^{-15} \,J$.

The average energy of a neutron produced in the fission of ${ }_{92}^{235} U$ is

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