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Q.

The planet Neptune travels around the sun with a period of 165 years. The ratio of its mean radius of the orbit to that of the earth is approximately

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a

10:1

b

20:1

c

30:1

d

40:1

answer is C.

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Detailed Solution

We are given radius of earth =r1

Time period=T1=1 year

Radius of Neptune=r2

Time period =T2=165 year    

(T1T2)2=(r1r2)3⇒r1r2=(1651)23

=30:1(nearly)

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