(a) Explain: (i) nuclear fission; (ii) nuclear fusion.

(b)(i) State three applications of atomic energy.

(ii) Define State. life.

(iii) Give the expression that relates the halflife, T, and the decay constant, X, of a radioactive material.

(c) A radioactive element X with atomic number 88 and mass number 226 emits in succession:

(i) an alpha particle, (ii) a beta particle and (iii) gamma radiation. Explain, using equations where necessary, the changes that take place in the atomic structure of the element at each stage.

The limiting frictional force between two surface depends on

I. the gaseous reaction between the surfaces

II. the nature of the surfaces in contact

III. the relative velocity between the surfaces

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

When blue and green colours of light are mixed, the resultant colour is

A metal rod has a length of 100cm at 200\(^oC\). At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 x 10\(^{-5}C^{-1}\)