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Q.

The escape velocity for the earth is  ve. The escape velocity for a planet whose radius is four times and density is nine times that of the earth, is

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a

36 ve

b

12 ve

c

6 ve

d

20 ve

answer is B.

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v∝Rρ∴vpve=RpRe×ρpρe=4×9=12⇒vp=12ve
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