During a thunderstorm, 4.0 s elapses between an observer’s seeing the lightning flash and hearing the thunder. If the observer sees the flash instantaneously, approximately how far away from the observer was the lightning flash? (speed of sound in air = 344 m/s)
How far away from the observer was the lightning flash?
Easy: distance = time x speed.
--%26gt; distance = 4 x 344 = 1376 meters
Assume we have a stop watch looking at the thunder storm, when light flashes, we start the stop watch. When we hear the thunder, we stop the watch and read the time. This time was 4 secs from your question. So the sound traveled a certain distance within those 4 secs. That distance can be found as above. Note that we started the stop watch at the moment the sound left its source and stopped it at the moment it reaches us.
Reply:(4.0sec)(344m/s) = 1376m.
About 4/5 mile.
Reply:1376 m.
Think about it. Light travels way faster than the sound.The origin of the sound and the lightning flash are the same. If it takes 4.0 s for the sound to travel at a rate of 344 m/s, multiply 344 by 4 which gives you an answer of 1376 m.
Reply:S = VT
DISTANCE = VELOCITY TIMES TIME
S = 344M/S X 4.0SEC.
S = 1376 METERS
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