Prove that the instantaneous rate of change of activity of a radioactive substance is inversely proportional to the square of half life.

Prove rthat the instantaneous rate of change of the activity of a radioactive substance is inversely propoertional to the square of its half-life.

Define half life of a radioactive substance.

Define half-life of a radioactive substance.

Prove that the rate of diffusion of a gas is inversely proportional to the square root of its density.

The activity of a radioactive substance is readuced by 80% in 100 days. Its half life is

Derive an expression for half life of a radioactive substance.

Distinguish between half and average life of a radioactive substance.