Question

redshift and blueshift quick check
why do scientists observe blueshift in certain stars? (1 point)
○ light wave frequencies increase as an object moves toward the observer.
○ stars with lower temperatures emit more light waves at the blue end of the spectrum.
○ light wave frequencies decrease as an object moves toward the observer.
○ stars with higher temperatures emit more light waves at the blue end of the spectrum.

Explanation:

Blueshift occurs when an object moves toward an observer, causing light waves to compress, increasing their frequency (shifting to blue). The first option matches this concept. Other options relate to star temperature (not blueshift cause) or incorrect frequency change direction.

Answer:

A. Light wave frequencies increase as an object moves toward the observer