1.

The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be ?

Answer»

27
40
56
120

Solution :NUCLEAR RADIUS , `R=R_0(A)^(1//3)`
where A is the MASS number of a nucleus .
GIVEN, R=3.6 fm
`therefore` 3.6 fm=(1.2 fm) `(A^(1//3)) "" [because R_0=1.2 fm]`
or A=`(3)^3`=27


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