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NCERT Class XII Chapter
Nuclei
Questions With Solutions

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Question : 11
Total: 31
Obtain approximately the ratio of the nuclear radii of the gold isotope
197
‌
79
Au and the silver isotope
107
‌
47
Ag
Solution:  
We know the radius of nucleus depend upon mass number ‘A’
As R = R0A1∕3 , where R0 = 1.1 × 10−15 m
∴
R(
197
‌
Au)
R(
107
‌
Ag)
 = (
197
107
)1∕3 = 1.23
Since the nuclear mass density is independent of the size of the nucleus,
so
ρnu(Au)
ρnu(Ag)
 = 1
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