Assertion : The binding energy per nucleon, for nuclei with atomic mass number $A > 100$, decreases with $A$.

Reason : The nuclear forces are weak for heavier nuclei.

The mass of an $\alpha$-particle is

A nucleus disintegrates into two smaller parts, which have their velocities in the ratio $3: 2$. The ratio of their nuclear sizes will be $\left(\frac{x}{3}\right)^{\frac{1}{3}}$. The value of ' $x$ ' is :

The mass number of a nucleus is equal to the number of

Assertion: Separation of isotope is possible because of the difference in electron numbers of isotope.
Reason: Isotope of an element can be separated by using a mass spectrometer