In the rings of Saturn,there are two main rings,the outer A ring and the inner B ring.How are the particles in these rings seen to move when examined (by Doppler effect of reflected sunlight)from Earth?
A) Particles in the A ring move more slowly than those in the B ring.
B) Speeds of the particles in all rings are the same because mutual gravitational forces between them ensure that they move as a solid disk.
C) Speeds of the particles vary because of attraction by the Sun, so A particles sometimes move faster and at other times B particles move faster.
D) Particles in the A ring move faster than particles in the B ring because they are farther from the planet.

Question

Quizplus · Accepted Answer

By examining the Doppler effect of reflected sunlight from Earth, particles in the A ring are seen to move more slowly than those in the B ring. This is because particles in the A ring are closer to Saturn and therefore are subject to stronger gravitational forces, which result in slower velocities compared to particles in the outer B ring.

In the Rings of Saturn,there Are Two Main Rings,the Outer