The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is `10^(8)` Then the number of radioactive nuclei left 5 minutes later would be:

Obtain an expression for the number of radioactive nuclei present at any instant in terms of the decay constant and initial number of nuclei.

A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

If N_(0) is the number of radioactive nuclei initially present , then the number of nuclei remaining undecayed at the end of nth half life is

If the number of nuclei in a radioactive sample at a given time is N, what will be the number at the end of two half-lives?

The time required for radioactive nuclei to disintegrate to half of its original number of nuclei is called

The half life period of a radio active material is 15 minutes. What percentage of radioactivity of that material will remain after 45 minutes ?

Assume that the rate at which radioactive nuclei decay is proportioanl to the number of such nuclei that are present in a given sample. In a certain sample 10% of the original number of radioactive nuclei have undergone disintegration in a period of 100 years. What percentage of the original radioactive nuclei will remain after 1000 years.?