the size of the nucleus is expressed by a still smaller unit is called
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1
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nanometers
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The unit of length convenient on the nuclear scale is a fermi : 1 f = 10
−15
m. Nuclear sizes obey roughly the following empirical relation : r=r
0
A
1/3
where, r is the radius of the nucleus, A its mass number, and r
o
is a constant equal to about 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus.
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