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

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

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

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.

Define radioactivity

Define the term 'conductivity' of a metallic wire. Write its SI unit.

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

Define gravitational constant. State its SI unit.

Define gravitational constant. State its S.I. unit.

Define intensity of a gravitational field. Write down its CGS and SI units.

Define electric electric flux. Write its SI unit.