Atoms and Nucle...

The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately

Consider the following two statements
A. Energy spectrum of α–particles emitted in radioactive decay is discrete
B. Energy spectrum of β–particles emitted in radioactive decay is continuous

A nucleus of an element ₈₄X²⁰² emits anα-particlefirst, a β–particle next and then a gamma photon. The final nucleus formed has an atomic number

3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance

A certain radioactive material _ZX^A starts emitting α and β particles successively such that the end product is _Z–3Y^A–8. The number of α and β particles emitted are

A radioactive substance emits

The large scale destruction, that would be caused due to the use of nuclear weapons is called

In beta decay

A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after5 years will be