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PHYSICS: GR. 8 COMPUTING FOR THE SPEED OF SOUND THROUGH AIR: MELC
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Here is the simple way of solving for the speed of sound traveling through air.
Sound can travel in air at approximately 332 meters per second. This is fast but not nearly as fast as light which travels at 300 000 kilometers per second. This difference in speeds enables us to appreciate that sound does take time to travel. When we see lightning the sound it produces at exactly the same time is often heard as thunder a few seconds later by an observer a few miles away. Unfortunately, children will not always accept that the light and sound are from the same instantaneous release of energy. It is, however, possible to watch a sound being made at some distance away and to detect a slight delay in hearing the sound. Exploding fireworks, the click of a ball on a cricket bat, and a child bashing a dustbin lid at the other end of a playing field will all provide this opportunity.
Sound can travel in air at approximately 332 meters per second. This is fast but not nearly as fast as light which travels at 300 000 kilometers per second. This difference in speeds enables us to appreciate that sound does take time to travel. When we see lightning the sound it produces at exactly the same time is often heard as thunder a few seconds later by an observer a few miles away. Unfortunately, children will not always accept that the light and sound are from the same instantaneous release of energy. It is, however, possible to watch a sound being made at some distance away and to detect a slight delay in hearing the sound. Exploding fireworks, the click of a ball on a cricket bat, and a child bashing a dustbin lid at the other end of a playing field will all provide this opportunity.
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