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The sound of thunder is heard 30 seconds after seeing the lightning flash. Given that the speed of sound is 330m/s,estimate the distance at which lightning

could have occurred?


see the attached document please.......
 i hope it helps............
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We know that the speed of light is more than the speed of sound in air, so we always see the lightening first and heard the sound later .
distance = speed × time 
              = 330×30
              = 9900 m
              = 9.9 km
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