By the emission of which radioactive ray from the atom of a radioactive element, no new atom is created?

Mention one practical application of controlled chain reaction. OR Why is a nuclear fission conducted before a nuclear fusion ?

The correct order of penetrating power of α-, β- and γ- rays is γ > α > β γ > β > α α > β > y β > γ > α

Which of the following rays has the highest capacity to ionise gases? (a) α-ray (b) γ-ray (c) β-ray (d) Light ray

State the S.I. unit of radioactivity.

What change will occur in atomic number if one β-particle is emitted from ²³⁵₉₂U?

Which one among the radioactive rays is an electromagnetic wave?

If the mass of an electron is m, then the mass of a β-particle is: (a) m (b) 2m (c) 3m (d) 4m

By which type of nuclear reaction is energy produced in a nuclear reactor?

Write the name of the positively charged radioactive particle.

Compare the charge, penetrating power and ionising power of α and γ rays.

There are 92 protons and 143 neutrons in the nucleus of a radioactive atom. If an α-particle is emitted from that atom how many protons and neutrons will be present in the nucleus of the new atom formed? What type of nuclear reaction is the source of energy of stars? [2 + 1]