Gravitation Question 163

Question: Escape velocity on the surface of earth is $ [11.2,km/s] $ . Escape velocity from a planet whose mass is the same as that of earth and radius 1/4 that of earth is[CBSE PMT 2000; JIPMER 2002; BHU 2004]

Options:

A) 2.8 km/s

B) 15.6 km/s

C) 22.4 km/s

D) 44.8 km/s

Show Answer

Answer:

Correct Answer: C

Solution:

$ [v_{e}\propto \frac{1}{\sqrt{R}}] $ .

If R becomes $ [\frac{1}{4}] $ then $ [v_{e}] $ will be 2 times.



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