State the law of radioactive decay and deduce an expression for half life of a radioactive substance.

Write the uses of : Radioactive substances

Define Half-life of radioactive material. Derive an expression for half-life period

State the law of radioactive decay. Hence derive the expression N = N_0(e^-lamda t) .lf where symbols have their usual meanings.

Write the harmful effects: Radioactive substances

State any four effects of radioactive pollution.

State the law of parallelogram of vectors.Obtain an expression for the magnitude of the resultant.

State the law of parallelogram of vectors. (i) Obtain an expression for the magnitude of the resultant. (ii) Obtain an expression for the direction of the resultant.

State Newton's II law of motion. Give the mathematical expression for it.

Tritium undergose radioactive decay giving

Name the following: The types of radiations given out by a radioactive substance.