Density of all the nuclei is same.
Radius of nucleus is directly proportional to the cube root of mass number.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false

Answer

A

Explanation

Experimentally, it is found that the average radius of a nucleus is given by `R= R_(0)A^(1//3)` where `R_(0)= 1.1 xx 10^(-15)m= 1.1 fm` and A = mass number