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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