The half-life of a radioactive substance is `60` days. A sample of it contains `1` mole nuclide. Calculate the number of disintegrations in the first second.

The half-life of a radioactive substance is 40 days. A sample of it contains 1 mole nuclie. Calculate the number of disintegrations in the first second.

The half-life of a radioactive substance is 10 days. This means that

The half - life of a radioactive substance is 50 days. The substance will disintegrate completely in

The half - life of a radioactive substance is 60 years. Calculate its decay constant given log e 2=6930

The half-life period of a radioactive substance is 30 days. What is the time taken for 3/4 the of its original masss to disintegrate ?

The half-life of a radioactive substance is 10 days. The time taken for the ((7)/(8)) th of the sample of disintegrates is

At a certain instant a piece of radioactive material contains 10^(12) atoms. The half life of material is 30 days. Calculate the no. of disintegrations in one second

Half-life of a radioactive substance is 2.9 days. Calculate the amount of 10 mg of substance left after 29 days.