Why do scientists observe blueshift in certain stars?(1 point)

Question

Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.

Light wave frequencies decrease as an object moves toward the observer.
Light wave frequencies decrease as an object moves toward the observer.

Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.

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

Answer 1

because they always say everything twice.
because they always say everything twice.

Answer 2

For anyone who actually needs the answers, its "Light wave frequencies increase as an object moves toward the observer."
For anyone who actually needs the answers, its "Light wave frequencies increase as an object moves toward the observer."

Answer 3

1. a,b 2. a 3.b