An object is moving very fast perpendicularly to your line of sight. What shift will you observe in its spectrum?
A) blue shift
B) red shift
C) yellow shift
D) no shift

Question

Quizplus · Accepted Answer

When an object moves perpendicularly to the line of sight, there is no change in the wavelength of light reaching the observer, so no Doppler shift (red or blue) is observed.

An Object Is Moving Very Fast Perpendicularly to Your Line