The Information on a Compact Disc Is Scanned by a Laser

Multiple Choice

The information on a compact disc is scanned by a laser initially at a radius of 2.4 cm and then out to a maximum of 6.0 cm.Because the dimensions of the pit information remains constant with radius the disk motor adjusts so that the tangential velocity remains a constant.What is the ratio of the inner to outer rotational frequencies?

A) 0.16
B) 6.3
C) 1.0
D) 2.5
E) 0.40