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Q.

The ratio of  radii of nuclei AI27 13  and X A 52  is 3 : 5.The number of neutrons in the nuclei of X will be

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a

52

b

73

c

125

d

13

answer is B.

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Detailed Solution

r∝A1/3⇒r1r2=A1A21/3⇒35=27A1/3⇒27125=27A⇒A=125Number of nuclei in atom X = A-52                                                         = 125 - 52 = 73.
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