![]() ![]() The basic equation for constant speed motion (shown below) applies to sound. A sound’s amplitude shrinks as it travels, but its speed remains constant. Eventually, the amplitude gets small enough that the sound is undetectable. Sound (in air) covers roughly 340 meters each and every second, even as its amplitude shrinks. ![]() As sound travels, its amplitude decreases- but that’s not the same thing as slowing down. That means sounds must slow down and come to a stop, right? Wrong. I know what you’re thinking- how is that possible? Sounds die out as they travel, right? True. Sound does not speed up or slow down as it travels (unless the properties of the material the sound is going through changes).
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