K K Sharma Solutions for Chapter: Nuclei, Exercise 1: TOPICWISE QUESTIONS

${}_{92}\mathrm{U}^{235}$ nucleus absorbs a slow neutron and undergoes fission into ${}_{54}\mathrm{X}^{139}$ and ${}_{38}\mathrm{Y}^{94}$ nuclei. The other particles produced in this fission process are

Two lithium (${\mathrm{Li}}^6$) nuclei in a lithium vapour at room temperature do not combine to form a carbon ${\mathrm{C}}^{12}$ nucleus because

Choose the statement which is true.

Fusion reaction takes place at high temperature because

In the nuclear fusion reaction, ${}_1{}^{}\mathrm{H}^2 + {}_1{}^{}\mathrm{H}^3 \stackrel{}{\to } {}_2{}^{}\mathrm{He}^4 +{}_0\mathrm{n}^1$, it is given that the repulsive potential energy between the two nuclei is approximately $7.7\times {10}^{-14} \mathrm{J}$. The temperature at which the gases must be heated, to initiate the reaction, is nearly (Boltzmann's constant, $k= 1.38 \times {10}^{-23 }\mathrm{J} {\mathrm{K}}^{-1}$)

Assuming that $200 \mathrm{MeV}$ of energy is released per fission of ${}_{92}\mathrm{U}^{235}$ atom, find the number of fission per second required to release $1 \mathrm{kW}$ power.

${10}^{14} \mathrm{fissions} \mathrm{per} \mathrm{second}$ are taking place in a nuclear reactor having efficiency $40\%$. The energy released per fission is $250 \mathrm{MeV}$. The power output of the reactor is

Energy is released in a nuclear fission because