Which ray has high ionising power? Why?

What is meant by fissile material? Give an example for fissile material?

What is nuclear chain reaction?

State the reasons. Why a chain reaction stops?

What are the essential parts of a nuclear reactor?

A fusion reaction is more energetic than a fission reaction. Why?

Define Roentgen.

What is meant by nuclear fission?

What is the reason for using lighter nuclei as moderators?

Why neutrons in the nucleus are stable?

Classify the neutrons according to their kinetic energy.

What causes the sun to expand?

How does thermonuclear fusion reaction occurs?

The ground state energy of hydrogen atom is -13.6 eV. What are k.E & P.E of the electron in this state?

Name the series of hydrogen spectrum which has the least wavelength and where it lies in the spectral region.