Suppose You Detect a Pulsar That Gives Us 1,000 Radio

Multiple Choice

Suppose you detect a pulsar that gives us 1,000 radio pulses per second, but the pulsar is in a distant galaxy that is apparently moving away from us at 50 percent of the speed of light. An observer at rest with respect to the pulsar in that faraway galaxy would measure a pulse rate of:

A) 870 per second
B) 1,150 per second
C) 1,250 per second
D) 1,366 per second
E) 1,450 per second