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Acoustical physics problems, how can calculate

Papaya Xiaozai2010-01-29 00:01:22 +0000 #1
Xiao Ming would like to know if the 100 meters race the end of the timer to start to hear the gunshots start running, then the start timing the time period starting later than the actual number?
boucelong2010-01-29 00:16:16 +0000 #2
Solution: t = s / v = 1m/340m/s = 1/340s

t '= s / v' = 1m / 3 * 10 ^ 8m / s = 1 / 3 * 10 ^ 8s

late hour: 1 / 3 * 10 ^ 8s-1/340s = approximately 0.29s
tianjianqi19902010-01-29 00:42:07 +0000 #3
of course, 100 ÷ speed of sound in呀! The general speed of sound is 340 meters per second ... ...

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