During a thunderstorm, 4.7s elapses between observing alightning flash and heari

Question

During a thunderstorm, 4.7s elapses between observing alightning flash and hearing the resulting thunder. Approximatelyhow far away in kilometers and miles was the lighting flash? _____km ______mi Picknickers see a lightning flash and hear the resultingthunder 7.9 s later. If the storm is traveling at a rate of 11km/h,how long, in minutes, do the picnickers have before the stormarrives at their location? ____min During a thunderstorm, 4.7s elapses between observing alightning flash and hearing the resulting thunder. Approximatelyhow far away in kilometers and miles was the lighting flash? _____km ______mi Picknickers see a lightning flash and hear the resultingthunder 7.9 s later. If the storm is traveling at a rate of 11km/h,how long, in minutes, do the picnickers have before the stormarrives at their location? ____min

Explanation / Answer

Time elapses T = 4.7 s

Let the required distance be S

Time taken to cover S distance by light t = S / c

t = S / ( 3* 10 ^ 8 m / s)

    = 3.3333* 10 ^ -9 S

Time taken to cover S distance by sound t ‘ = S /v

t’ = S / ( 343 m / s)

    = 2.9154* 10 ^ -3 * S

We know T = t – t’

           4.7= 2.9154 * 10^ -3 * S

             S = 1612.1 m

                 = 1.6121 km

We know 1 mile = 1.609 km

                 1 km = 1/ 1.609 miles

                           = 1.001 miles      

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