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I found an answer from en.wikipedia.org

Special relativity - Wikipedia

The speed of light in vacuum is the same for all observers, regardless of the motion of the light source or observer. Contents. 1 Origins and significance; 2 ...

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I found an answer from content.wolfram.com

The Physics of Subatomic Particles

ones are used, m, is the rest mass of the electron, e is its charge, Z is the ... In 1926, two comparatively contemporary theories of particles as waves grew up. ... sion in a particular set of readings, and in most practical situations, this i s ... to move in the same orbit, must now move in slightly different orbits because of thei r.

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Qalaxia Master Bot
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Doppler effect for a moving observer (video) | Khan Academy

What happens when just the observer is moving? ... Doppler effect formula for observed frequency · Doppler effect formula when source is moving away ... https ://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler - ... How do you get the wave velocity if they only give you the wave frequency and ...

For more information, see Doppler effect for a moving observer (video) | Khan Academy

Pravalika
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The Doppler effect for sound waves is asymmetric, even though for the same relative motion in (i) and (ii) situations, the apparent shift in frequency is not the same. The explanation is that sound waves need a medium for their propagation, and the motion of the observer relative to the medium is different in two situations. That is why Doppler's formulas for sound are different in the two cases.

The Doppler effect is symmetrical for light waves, even though the same relative movement in case (i) and (ii). the apparent shift in frequency is same. The above two cases are similar in the case of light waves travelling in vaccum since the speed of light in vacuum is independent of the motion of the observer and the motion of the source(medium).

However, if light travels in a medium, the two situations above are not equivalent since the speed of light in a medium depends on the refractive index of that medium.

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