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Question

# The most common kind of iron nucleus has a mass number of 56. Find the radius of the nucleus. (Take R0=1.2×10−15 m:(56)13=3.82)

A
1.2 fm
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B
1.8 fm
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C
4.6 fm
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D
5.2 fm
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Solution

## The correct option is C 4.6 fmThe shape of the nucleus is approximately spherical, and its radius is approximately related to the mass number as R=R0A13 ⇒R=(1.2×10−15 m)(56)13 ⇒R=4.6×10−15 m=4.6 fm Hence, option (C) is correct. Why this Question? The shape of the nucleus is approximately spherical, and its radius is approximately related to the mass number by R=R0A13

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