A Doppler red shift indicates
A) a shift toward lower frequencies.
B) a shift toward longer wavelengths.
C) that a light source is receding relative to the observer.
D) all of these.

Question

Quizplus · Accepted Answer

All the statements accurately describe a Doppler red shift: it involves a shift toward lower frequencies and longer wavelengths, indicating that the light source is moving away from the observer.

A Doppler Red Shift Indicates