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Question: Answered & Verified by Expert
If the radius of a planet is 'R' and density ' $\varrho$ ', then the escape velocity 'Ve' of any
body from its surface will be proportional to
PhysicsGravitationMHT CETMHT CET 2020 (20 Oct Shift 1)
Options:
  • A $\mathrm{R}$
  • B $\frac{\sqrt{\varrho}}{\mathrm{R}}$
  • C $\mathrm{R} \sqrt{\rho}$
  • D $\frac{\mathrm{R}}{\sqrt{\rho}$
Solution:
1023 Upvotes Verified Answer
The correct answer is: $\mathrm{R} \sqrt{\rho}$
$v_{e}=\sqrt{\frac{G M}{R}}=\sqrt{\frac{G \frac{4}{3} \pi R^{3} \rho}{R}}=k R \sqrt{\rho}$
$v_{e} \propto R \sqrt{\rho}$

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