The large-scale destruction that would be caused due to the use of nuclear weapons is called:

$A$ nucleus with mass number $220$ initially at rest emits an $\alpha -$ particle. If the $Q$ value of the reaction is $7.8 \, MeV$ and subsequently after the emission of the $\alpha -$ particle,a photon of energy $1.2 \, MeV$ is also emitted. The kinetic energy of the $\alpha -$ particle is ? .......... $MeV$

Which of the following is used as a moderator in nuclear reactors?

What is a nuclear chain reaction? Explain the difficulties and their removal for its successful operation.

$A$ nucleus is bombarded with a high-speed neutron so that the resulting nucleus is a radioactive one. This phenomenon is called:

In a nuclear reactor,heavy nuclei are not used as moderators because: