Half-life of a radioactive substance is 30 days. Number of atoms in the substance is `10^12`. How many disintegration of atoms per second does occur?

The half-life of a radioactive substance is 1 y. After 2 y, what will the amount of the substance that will be disintegrated?

Half-life of a radioactive substance is 20 minute. The time between 20% and 80% decay will be

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1g atom sample?

What is mean life of radioactive substance ? Show its relation with half-life .

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.

The rate of disintegration of a radioactive element at any instant is 10^3 dps. If the half-life of that element is 1 second, then what is its rate of disintegration after 1 second and after 3 second?

In 8000 y, a radioactive substance reduces a 1/32 th part of its initial amount. Determine its half-life.

How many bridging oxygen atoms are present in P 4 O 10

Half-life period of a radioactive element is 100 seconds. Calculate the disintegration constant and average life period. How much time will it take for 90% decay?

The half-life of a radioactive element is 1600 y. After what time 10% of that element present in any radioactive sample will disintegrate?