Dark matter is believed to:

Radiation used in cancer treatment is:

Atoms of the same element with different mass numbers are called:

The nucleus is extremely small compared to the:

Which observation supports the existence of dark matter?

Gamma rays are:

Background radiation mainly comes from:

Mass number of an atom is equal to:

Control rods in a nuclear reactor absorb:

Which decay results in the emission of an electron?

Which element is commonly used as fuel in nuclear reactors?

Nuclear fission is the process of:

Ionizing radiations mainly cause damage by:

Which nuclear radiation is unaffected by electric fields?

Fusion requires very high:

Beta particles are:

Which radiation has the highest penetrating power?

Which radiation has the highest ionizing power?

Which process releases more energy per unit mass?

The main source of energy of the Sun is: