Nuclear Energy

Why are moderators more effective in slowing the fast moving neutrons instead of abundant ${}^{238}\mathrm{U}$ atoms found in the naturally occurring $\mathrm{U}$ sample?

Multiplication factor or reproduction factor $K$ for a nuclear reactor is defined as number of fission reactions produced by a given generation of neutrons to the number of fission reactions in the preceding generation. What should be the value of $K$ for the following purposes?

i. To keep the nuclear fission reaction self-sustaining.

ii. To switch off the nuclear reactor.

Draw a schematic labelled diagram of a nuclear reactor based on thermal neutron fission. What is a moderator? Give two examples of moderator. Write a few lines on controlled thermonuclear fission.

Complete the given Nuclear fusion reaction by finding $x$ in it:

${}_1{}^2\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^3\mathrm{He}+x+3.2 \mathrm{MeV}$

How long can an electric lamp of $100\mathrm{W}$ be kept glowing by fusion of $2.0\mathrm{}\mathrm{k}\mathrm{g}$ of deuterium? Take the fusion reaction as

${}_1{}^2\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^3\mathrm{H}\mathrm{e}+\mathrm{n}+3.27\mathrm{}\mathrm{M}\mathrm{e}\mathrm{V}$

Define endoergic reaction.

Can uncontrolled chain reaction can be controlled? explain.

What is the underlying principle of the atomic bomb in respect of nuclear energy.

What is the proton-proton chain reaction? Describe this process.

The _____ is an example of endoergic nuclear reaction.

Describe the endoergic nuclear reaction?

When the energy value Q is positive, the reaction is positive.

When the energy value Q is positive, the reaction is_____

Hydrogen bomb has been prepared by the fusion of:

Describe the working of Hydrogen bomb.

The explosion of hydrogen bomb is based on the principle of:

How is a nuclear chain reaction controlled in a nuclear reactor?

What is a controlled nuclear chain reaction?

How can an uncontrolled nuclear chain reaction lead to atomic explosion?

What is an uncontrolled nuclear chain reaction?