If a light-emitting object is moving away from you, you observe its wavelengths to be ________ its wavelengths if it were at rest.
A)longer than
B)shorter than
C)the same as

Question

Quizplus · Accepted Answer

When an object is moving away from you, the wavelengths of the light it emits get stretched out, which results in a shift toward longer wavelengths or lower frequencies. This phenomenon is known as redshift. Therefore, the observed wavelengths would be longer than if the object were at rest.

If a Light-Emitting Object Is Moving Away from You, You