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Carry out a simple activity to measure the speed of sound with a friend in a large open ground (200 m or more), using balloons and a stopwatch: time the gap between seeing a balloon burst and hearing it, then divide the measured distance by the average time.
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Because light reaches you almost instantly, the timed gap is the sound’s travel time. Dividing distance by the average time gives a speed close to 346 m/s at 25 °C. Repeat and average to reduce error.
