For the fission reaction

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

^{235}_{92}\text{U}+^{1}_{0}\text{n}\;\rightarrow\;^{141}_{56}\text{Ba}+^{92}_{36}\text{Kr}+3\,^{1}_{0}\text{n}

, the atomic masses (in u) are:

^{235}_{92}\text{U}=235.043929

^{141}_{56}\text{Ba}=140.914411

^{92}_{36}\text{Kr}=91.926156

^{1}_{0}\text{n}=1.008665

. Which of the following pairs best represents the energy released by one such fission event, expressed in both MeV and joules? (Take

1\,\text{u}=931.5\,\text{MeV}\,c^{-2}

and

1\,\text{MeV}=1.602\times10^{-13}\,\text{J}

.) (a)

-1.73\times10^{2}\,\text{MeV};\;-2.8\times10^{-11}\,\text{J}

(b)

1.86\times10^{2}\,\text{MeV};\;3.0\times10^{-11}\,\text{J}

(c)

1.73\times10^{2}\,\text{MeV};\;2.8\times10^{-11}\,\text{J}

(d)

1.73\times10^{1}\,\text{MeV};\;2.8\times10^{-12}\,\text{J}