The radius of a planet is 4 times the radius of the earth. The time period of revolution of the planet will be:
A
1 yr
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B
2 yr
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C
4 yr
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D
8 yr
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Solution
The correct option is D 8 yr According to Kepler's law T2αR3→(I)
Now, R1=4R
So, T21αR31 T21α64R3→(II)
on dividing both equations, we get, T2T21=164 T1=8T
i.e, It will take 8 years to complete a revolution.