Question

why do scientists observe blueshift in certain stars?

a. stars with higher temperatures emit more light waves at the blue end of the spectrum
b. light wave frequencies decrease as an object moves toward the observer
c. light wave frequencies increase as an object moves toward the observer
d. stars with lower temperatures emit more light waves at the blue end of the spectrum

Answer 1

[AI-generated answer — Bot GPT 3.5]

c. light wave frequencies increase as an object moves toward the observer

Blueshift is observed in certain stars because as they move closer to Earth, the light waves they emit are compressed and have higher frequencies, causing them to shift towards the blue end of the spectrum. This is known as the Doppler effect.