A very significant quantity that can be measured directly for small numbers of atoms is the mean lifetime. If there are n active nuclei, (atoms) (of the same type, of course), the mean life is

8. Where |dN| is the number of nuclei decaying between t, t + dt; the modulus sign is required to ensure that it is positive.

Illustration 1: Cascade Decays: Frequently, a nucleus A decays into another nucleus B, which again decays into C, and so on until the series ends in a stable nuclide. These are known as cascade decays. We will consider a simple example of a cascade decay where a nuclide a decays into B, and then, B decays into C:

« Previous Next »

Click Here to Go Back to CBSE Class 12 Physics Atoms & Nuclei All Topic Notes

Click Here for CBSE Class 12 Physics All Chapters Notes

Mody University Apply Now!!

Leave a Reply