Give a brief account on the application of radio isotopes.

Explanation

(a) Radio isotopes are used to eliminate harmful pests which destroy crops.
(b) Radio carbon `(C^(14))` is used to study the kinetics of plants photosynthesis.
(c) Radio isotopes are used to manufacture self luminous paints.
(d) Metallurgists use radio isotopes in the study of alloys.
(e) Radiation from radio isotopes is used for uniform mixing of lubricants and greases.
(f) Radio phosphorous is used in treating skin diseases.
(g) Radio cobalt and radio gold are used in curing cancer.
(h) Radio isotopes are used in estimating the age of the earth.