List of top Physics Questions on Nuclei asked in Punjab PMET

Binding energy of nucleus is defined as

A radioactive element $ x $ converts into another stable element $ y $ . Half-life of $ x $ is $ 2h $ , initially only $ x $ is present. After time $ t $ , the ratio of atoms of $ x $ and $ y $ is found to be $ 1:4 $ , then $ c $ in hour is

A count rate metre shows a count of $240/\min$ from a given radioactive source later the metre shows a count rate of $30/\min$. The half-life of the source is

After 2 h $\frac{1}{16} th $ of initial amount of a certain radioactive isotope remains undecayed. The half-life of the isotope is

The X-ray cannot be diffracted by means of an ordinary grating due to