The rate of disintegration of a radioactive substance is `……………………………` to the number of atoms present at that time .

The rate of disintegration of a radioactive sample can be increased by :-

The rate of disintegration at a given instant, is directly proportional to the number of atoms present at that instant. This is the statement of

The rate of disintegration at a given instant, is directly proportional to the number of atoms present at that instant.This is the statement of

Classify the following statements into true or false. i. Radioactivity is unaffected by pressure and temperature. ii. Radioactivity is affected by large electric and magnetic fields. iii. The rate of disintegration of a radioactive substance at a particular time is directly proportional to the number of atoms present initially. iv. Nuclear force is charge independent but it depends on the relative orientation of the spins.

In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at an instant of time equal to its mean life is

In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at an instant of time equal to its mean life is

When the quantity of a radioactive substance is increased two times, the number of atoms disintegrating per unit time is

When the quantity of a radioactive substance is ncreased to two times, the number of atoms disintegrated per unit time is :