Q.
ve and vp denotes the escape velocity from the earth and another planet having twice the radius and the same mean density as the earth. Then
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a
ve=vp
b
ve=vp/2
c
ve=2vp
d
ve=vp/4
answer is B.
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Detailed Solution
ve=2GMR=R83πGρIf mean density is constant then ve∝Rvevp=ReRp=12⇒ve=vp2
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