A planet has radius

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A planet has radius

R

. A satellite orbits the planet at a height equal to

R

above the surface (orbital radius

2R

). What is the ratio of its orbital speed to the orbital speed of a satellite that orbits just above the surface? (a)

\sqrt{2}

(b)

1

(c)

\dfrac{1}{\sqrt{2}}

(d)

\dfrac{1}{2}