Why do scientists observe blueshift in certain stars?(1 point)
Responses
Light wave frequencies increase as an object moves toward the observer.
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 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 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.
When scientists observe blueshift in certain stars, it means that the light waves emitted by those stars have higher frequencies than what we would expect. This phenomenon occurs because of the Doppler effect.
The Doppler effect is the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave. In the case of light waves, when an object emitting light is moving towards an observer, the wavelengths of the light waves appear shorter, which corresponds to an increase in frequency. And since blue light has a higher frequency than red light, the phenomenon is called blueshift.
So, when scientists observe blueshift in certain stars, it means that those stars are moving towards us, causing the light waves they emit to be shifted towards the higher frequency/blue end of the spectrum. This observation can provide valuable information about the motion and velocity of celestial objects.