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It can tell us whether a star, or a galaxy, is moving towards us or away from us.
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∙ 8y ago
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When light waves are stretched by an object moving away from us?
Doppler effect Red Shift
What is the red shift of light from most galaxies is evidence that?
The most plausible explanation for the redshift is that galaxies are moving away from us. This is similar to the Doppler effect, but it is normally believed that space itself is expanding, so the situation is a bit different from the "normal" Doppler effect.
Why are the blueshift and redshift useful in the study of the universe?
Redshift and blueshift are manifestations of the Doppler effect. This lets us determine whether a star, or a galaxy, is moving towards us, or away from us.
What is Doppler red shift?
Its part of science! Edit : In astronomy, the Doppler effect is the change in wavelength of light caused by movement of a light source such as a star or a whole galaxy. The term "red shift" refers to the increase in the light's wavelength from the blue to the red end of the spectrum. This happens when a light source is moving away from us. I don't want to over complicate things, but there is a similar thing called the "cosmological red shift ", but that's caused by the expansion of space itself.
An observation of the red shift of galaxies suggest that the universe is?
... expanding. The redshift is attributed to the Doppler effect, meaning that those galaxies are receding, or getting away, from us.
What does the Doppler Effect tell astronomers about the universe?
It tells us that the Universe is expanding.
The blank effect allows us to use the spectrum to study a source's motion?
The Doppler affect
The apparent change in frequency as a wave source moves in relation to the listener is called?
The Doppler effect is that apparent change of the frequency of a moving object when someone is stationary. A car may seem to get louder as it gets closer to a person and then the sound will drop as the car gets away.
How can you tell that some galaxies are far away and moving rapidly towards us?
You can tell by the blueshift in the spectrum; the only reasonable explanation for this blueshift is the Doppler effect. - Please note that most galaxies are moving away from us, not towards us.
How is the Doppler effect used in astromomy?
It is used to determine whether an object is approaching us, or moving away from us. It turns out that - as can be seen from the Doppler effect - most galaxies are moving away from us. In other words, the Universe is expanding.
Do you use the Doppler effect or particle accelerators to measure the speed of stars?
The Doppler effect is used to detect whether a star is moving away from us or towards us. This method doesn't tell us anything about a star's "sideways" movement. OR The Doppler Effect should be corrected for the (gravitational) size of the star, since gravity also changes the light's energy. re: Sideways movement, I thought special relativity reacts to sideways motions? Besides, how long can a star be traveling sideways -- technically, no distance.
How can the Doppler effect help us?
By determining the speed of an object, towards or away from the observer.
Does a star that shows no Doppler shift move?
If there is no observable Doppler shift, then the star is probably not moving very fast. This refers to the component of the star's movement toward us, or away from us - the "sideways" part of the movement can't be determined by the Doppler effect.
When light waves are stretched by an object moving away from us?
Doppler effect Red Shift
What has the electromagnetic spectrum got to do with the Doppler Effect?
The Doppler effect affects any wave, including electromagnetic waves. Basically, the idea of the Doppler effect is that the frequency of a wave increases when an object approaches you, and it decreases when it moves away from you. You can imagine that the sound waves, or electromagnetic waves, become compressed when the emitting object moves toward you.
What did the us do after the 1957 launch of sputnik?
Observed it and found out that the amplitude of beeps from it changes because of the Doppler effect.
How can you measure how fast the universe is expanding?
By using some method other than the Doppler effect to calculate the distance of a distant galaxy, and using the Doppler effect to see how fast it moves away from us. A galaxy's distance and how fast it moves away from us are roughly proportional.
