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Does Redshift/ Blueshift occurs when only the observer is moving?
In special relativity, an observer is a frame of reference from which a set of objects or events are being measured. Usually this is an inertial reference frame or "inertial observer".
When only the observer moves, based on Doppler's effect, frequency for waves change due to the change in the velocity of the wave particles perceived by the user.
Yet my highschool teacher(Yes I'm currently only a highschooler) claims that red/blueshift indeed occurs when only the observer is moving.
So, does Redshift/ Blueshift occurs when only the observer is moving?Thanks in advance.
Does Redshift/ Blueshift occur when only the observer is moving?
Does Redshift/ Blueshift occur when only the light source is moving?
What changed is the fact that as the light source moves towards the detector its emitting wave peaks (and wave crests) at shorter distances in space because the light source has moved during the time that the last peak was emitted.
Let's say that you measure everything from the light source (what is described above as "the frame of reference" of the light source). You have an astronaut who is moving relative to that light source, who will experience redshift or blueshift, depending on whether he is moving away or towards the light source.So the answer is "Yes".
But if the light source is stationary, and the light detector moves relative to the source and observer, the wavelength of light should remain the same.
Just remember that the speed of light is the same for all observers. Space and time (which are not constant, or even "things", since they are not conserved) adjust (dilate) to keep c a constant. If you look at a spacetime diagram, in which time is just another dimension like the space dimensions, the speed of light, c, corresponds to the equal angle between space and time.