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

Question

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

Responses

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.

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

Answer 1

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

Answer 2

The correct answer is: Light wave frequencies increase as an object moves toward the observer.

Answer 3

The correct response is: "Light wave frequencies increase as an object moves toward the observer." When scientists observe blueshift in certain stars, it means that the light waves emitted by those stars have a higher frequency, or shorter wavelength, than what would be expected. This phenomenon occurs because the stars are moving towards the observer, causing the wavelengths of the light waves to get compressed or "squeezed" as they are observed. This compression of the wavelengths shifts the light towards the blue end of the spectrum, resulting in a blueshift. By measuring the amount of blueshift, scientists can determine the velocity and direction of the star's motion relative to Earth.