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Because these two phenomena, joined by scientifically not quite correct metaphora "waves" - are based on different principles. Sound needs media to travel. Light doesn't need. Sound is basically vibrations of media molecules less distance between molecules (higher density) better and faster energy transfer. For light it's almost completely opposite. Light is being absorbed and reemitted by media molecules. This process takes some time which is slows down light speed.

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Does sound travel 4 times faster in liquid?

No it actually travels slower.


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If one car travels at an average speed of 48 miles per hour A slower car travels an average speed of 36 miles per hour how many more miles per hour does the faster car travel than the slower car?

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Does sound travel faster in air in summer or in winter?

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Do asteroids travel faster than light?

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