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 of a radioactive substance.

Define radioactivity of a radioactive substance?

define activity of a radioactive material and write its Si units.

Define the activity of a radio nuclide. Write its S.I. unit. Give a plot of the activity of a radioactive species versus time. How long will a radioactive isotope, whose half life is T years, take for its activity to reduce to 1//8 th of its initial value ?