1.

The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is v. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is [MNR 1994]

A.             \[\frac{3}{2}v\]          
B.             \[\sqrt{\frac{3}{2}}\,v\]
C.             \[\sqrt{\frac{2}{3}}\,v\]         
D.             \[\frac{2}{3}\,v\]
Answer» D.             \[\frac{2}{3}\,v\]


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