Why do scientists observe blueshift in certain stars? (1 point)
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.
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
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.
The correct answer is "Light wave frequencies increase as an object moves toward the observer." (1 point)
When scientists observe a blueshift in certain stars, it means that the light waves emitted by those stars have been shifted to higher frequencies or shorter wavelengths. This happens when an object, such as a star, is moving towards the observer.
To understand why this occurs, let's consider the concept of Doppler effect. The Doppler effect describes how the frequency of light waves changes when the source of light or the observer is in motion relative to each other. When an object emitting light waves is moving towards an observer, the waves get compressed, resulting in a higher frequency and shorter wavelength. This shift towards higher frequencies is observed as a blueshift.
Therefore, scientists observe blueshift in certain stars when those stars are moving towards us, causing the light waves emitted by them to have higher frequencies.