What is meant by activity of a radioactive sunstance? Write its SI unit.

What is meant by activity of a radioactive substance? Write its SI unit.

Define the activity of a given radioactive substance. Write its SI unit.

What do you mean by 'activity' of a radioactive sample ?

What is meant by half life of a radioactive element?

What is meant by activation energy of a reaction ?

Define the Activity of a radioactive sample. Write its S.I. unit. A radioactive sample has activity of 10000 disintegrations per second (dps) after 20 hours. After next 10 hours its Activity reduces to 5000 dps. Find out its half-life and initial activity.

What do you mean by current sensitivity of a galvanometers ? Write its SI unit.

What is the unit of radioactivity in SI unit?

Define cofficient of surface expansion. Write its SI unit.

Define impulse. Write down its S.I. unit.