Question

The explosion of atom bomb is based on the principle of:
A. Uncontrolled fission reaction
B. Controlled Fission reaction
C. Fusion reaction
D. Thermonuclear reaction

Answer 1

In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction or a radioactive decay process in which the nuclear energy of an atom split two or more smaller, lighter nuclei.

Complete step by step answer:
J. Robert Oppenheimer is often called the father of the atomic bomb for leading the Manhattan project that developed the first nuclear weapon during world war II.
In the atom bomb nuclear fission takes place. It is a nuclear reaction in which a heavy nucleus splits into two or more smaller, lighter nuclei. Most of the fissions are binary. Four out of one thousand are ternary. The daughter nuclei are of comparable size. Spontaneous fission is also known as radioactivity. It is induced by the protons or alpha particles or induced by neutrons.
Nuclear Fission is a form of the nuclear inside an atom that is split into fragments with mass and at the same amount of Energy.
In an atom bomb, the energy is exposed very violently and explosively causing massive damage and destruction. Most of the elements are stable in nature and uranium and plutonium are the only natural elements that can be split by bombardment through accelerators. Large nuclei are made to bombard to give rise to smaller nuclei which lead to a chain reaction and explosion of Massive energy. Therefore, the correct choice is: (A) Uncontrolled Fission reaction.

Note:
In uncontrolled, one fission reaction starts a chain reaction, in which neutrons produced in one reaction cause another reaction, which causes more reactions, and so on. Energy released by nuclear fission is used to produce electrical energy in nuclear power plants in a controlled manner.