Mass density of a nucleus varies with mass number A as

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13.Nuclei

easy

The mass density of a nucleus varies with mass number $A$ as

A

$A^2$

B

$A$

C

constant

D

$1/A$

(AIPMT-1992)

Solution

Nuclear radius $r \propto {A^{1/3}}$

Hence $A \propto {a^3}$. Since density $=$ Mass/Volume
Mass $ \propto A$. Also volume $ \propto {a^3}$.
Hence Mass/volume $=$ constant

Standard 12

Physics

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