Question

Energy released in the fission of a single $$_{92}{U^{235}}$$  nucleus is $$200\,MeV.$$  The fission rate of a $$_{92}{U^{235}}$$  filled reactor operating at a power level of $$5\,W$$  is

A. $$1.56 \times {10^{ - 10}}{s^{ - 1}}$$
B. $$1.56 \times {10^{11}}{s^{ - 1}}$$  
C. $$1.56 \times {10^{ - 16}}{s^{ - 1}}$$
D. $$1.56 \times {10^{ - 17}}{s^{ - 1}}$$
Answer :   $$1.56 \times {10^{11}}{s^{ - 1}}$$
Solution :
Fission rate = $$\frac{{{\text{total nuclear power}}}}{{{\text{energy produced/fission}}}}$$
Here, total nuclear power $$= 5\,W$$
Energy released per fission $$= 200\,MeV$$
∴ Fission rate $$ = \frac{5}{{200\,MeV}}$$
$$\eqalign{ & = \frac{5}{{200 \times 1.6 \times {{10}^{ - 13}}}}\,\,\left[ {\because 1\,MeV = 1.6 \times {{10}^{ - 13}}J} \right] \cr & = 1.56 \times {10^{11}}{s^{ - 1}} \cr} $$

Releted MCQ Question on
Modern Physics >> Atoms or Nuclear Fission and Fusion

Releted Question 1

The equation
$$4_1^1{H^ + } \to _2^4H{e^{2 + }} + 2{e^ - } + 26MeV$$       represents

A. $$\beta $$ -decay
B. $$\gamma $$ -decay
C. fusion
D. fission
Releted Question 2

Fast neutrons can easily be slowed down by

A. the use of lead shielding
B. passing them through water
C. elastic collisions with heavy nuclei
D. applying a strong electric field
Releted Question 3

In the nuclear fusion reaction
$$_1^2H + _1^3H \to _2^4He + n$$
given that the repulsive potential energy between the two nuclei is $$ \sim 7.7 \times {10^{ - 14}}J,$$    the temperature at which the gases must be heated to initiate the reaction is nearly
[Boltzmann’s Constant $$k = 1.38 \times {10^{ - 23}}J/K$$    ]

A. $${10^7}K$$
B. $${10^5}K$$
C. $${10^3}K$$
D. $${10^9}K$$
Releted Question 4

The binding energy per nucleon of deuteron $$\left( {_1^2H} \right)$$ and helium nucleus $$\left( {_2^4He} \right)$$  is $$1.1\,MeV$$  and $$7\,MeV$$  respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

A. $$23.6\,MeV$$
B. $$26.9\,MeV$$
C. $$13.9\,MeV$$
D. $$19.2\,MeV$$

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