If the change in wavelength is less than zero, then the radial velocity tells you that the star is moving _______________ you.
A)parallel to
B)away from
C)towards
D)in circles around

Question

Quizplus · Accepted Answer

If the change in wavelength is less than zero, it means that the wavelength of light emitted by the star is decreasing, indicating that it is moving towards us. This is known as a blueshift, and is caused by the Doppler effect.

If the Change in Wavelength Is Less Than Zero, Then