A certain light source blinks once per second in its own frame of reference. As you recede from the blinking source, you observe the frequency of blinks to be
A)less than 1 Hz.
B)1 Hz.
C)more than 1 Hz.

Question

Quizplus · Accepted Answer

As you recede from the blinking source, the frequency of the blinks appears to decrease due to the Doppler effect. This means that the observed frequency will be less than the emitted frequency, so the correct choice is A, less than 1 Hz.

A Certain Light Source Blinks Once Per Second in Its