Q: What is half life time?
Ans: The half life of an element is that time during which the number of atoms of that element are reduced to one half. i.e half life of uranium is 4.5 x 10⁹ years.
Q: Define fission reaction.
Ans: Breaking of a nucleus into two parts with the release of large amount of energy is called fission reaction. i.e
Q: What is Atomic Mass Number?
The sum of neutrons and protons present in a nucleus is called its Atomic Mass number. It is denoted by the letter A. i.e
where 16 14 and 12 are atomic mass numbers of oxygen, nitrogen and carbon respectively.Q: What is natural radioactivity?
Ans: The elements whose atomic number is greater than 82 naturally break and emit alpha, beta and gamma particles. The natural process of breaking of the elements is called natural radioactivity. i.e Uranium
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