Why do scientists observe blueshift in certain stars?(1 point)
Responses
Light wave frequencies decrease as an object moves toward the observer.
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.
Stars with higher 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.
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.
The correct answer is: Light wave frequencies increase as an object moves toward the observer.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
The correct answer 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 been shifted towards higher frequencies, or the blue end of the spectrum. This happens because of a phenomenon called the Doppler effect.
The Doppler effect occurs when there is relative motion between the source of the waves (in this case, the star) and the observer (in this case, the scientists). When the star is moving closer to the observer, the waves become compressed, causing an increase in frequency. This increase in frequency is perceived as a blueshift.
To determine whether a star is blueshifted, scientists analyze the spectrum of light emitted by the star. They use a spectrograph to break down the star's light into its individual wavelengths. By comparing the observed wavelengths with the known wavelengths of different elements, scientists can identify any shifts towards higher frequencies or the blue end of the spectrum, indicating a blueshift.