Question

The radioactivity disintegration is an example of
A) Zero order reaction.
B) First order reaction.
C) Second order reaction.
D) Third order reaction.

Answer 1

Hint:First of all we should know about the radioactivity. Radioactivity is the process of spontaneous emission of radiation in the form of particles or high energy photons. It is the result of a nuclear reaction. The substance which has unstable atomic nuclei is termed as radioactive substance.

Complete answer:
The process in which an unstable atomic nucleus loses its energy by radiation is termed as the radioactive disintegration. The substance which consists of unstable nuclei is called a radioactive substance.
Nuclear decay took place only when the nucleus of an atom is unstable and it is spontaneously emitting energy in the form of radiation. The result of the nuclear decay is that the nucleus breaks into the nucleus of one or more elements.
The phenomenon of radioactivity was discovered by Henri Becquerel, but it was named by Marie Curie, who was his doctoral student.
The rate of radioactive decay is directly proportional to the number of nuclei present in the sample. This indicates that the radioactive decay is constant.
Thus from the rate equation, it is clear that radioactive decay is a first-order reaction.
Hence, the option b is correct.

Note: A radioactive atom tries to attend in order to get stability by ejecting nucleons (protons or neutrons), as well as other particles, or by releasing energy in other forms. The nucleus of the radioactive element is very unstable.