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Measure this time interval using a digit...

Measure this time interval using a digital wrist watch or a stopwatch.
Calculate the distance of the nearest point of lightning (Speed of sound in air = 346 `ms^(-1)`)

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Suppose the sound of thunder is heard 2 second after the lightning was seen.
`to` The distance of the nearest point of lightning = speed `xx` time `= 346 m s^(-1) xx2 s = 692 m`
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