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18 September, 13:40

How to measure the speed of sound in air?

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  1. 18 September, 13:59
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    STEP ONE:

    Let you and your friend stand as far away as possible from a large reflecting wall and clap your hands rapidly at a regular rate.

    STEP TWO:

    Adjust this rate until each clap just coincides with the return of an echo of its predecessor, or until clap and echo are heard as equally spaced.

    STEP THREE:

    Use a stopwatch to find the time between claps, t. Make a rough measurement of distance to the wall, s. Thus the speed of sound, v = 2s/t
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