Wave Speed
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The wave speed is determined by the properties of the fluid such as water, or air.
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In air, the wavespeed of sound is about 1100 feet per second
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In water, the wavespeed of sound is somewhat quicker
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In space, where there is no air, sound doesn't propagate because there is not a fluid to transmit the vibrations.
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You have seen science fiction movies with explosions in space, and you hear the sound of the explosion in the movie because it makes the scene work better as part of the story.
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You may have heard that this is not physically true because of the vacuum of space, so sound would not propagate from the explosion to the listener.
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HOWEVER, it is not entirely true that you would not hear an explosion in space: when there is an explosion, all sorts of stuff gets thrown around very quickly, including the air from the spaceship exploding, and the chemical reactions of the explosion. Thus, you would hear all this stuff hitting the side of your space ship, and so you would hear the explosion. BUT it would not sound the same as it would if you heard it on Earth.
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Like fireworks, you would see the explosion before you hear the sound because sound waves (and explosion debris) travel slower than light waves.
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