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PHYSICS HOMEWORK HELP: Boundary and wave interaction.?
A lightning flash is seen and thunder is heard three seconds later. If the speed of sound is 340 m/s and the speed of light is 3x10^8 m/s, how far away did the lightning strike?
Please show me all the step and formulas used to solve this question. I have to solve a couple more like this one and want to understand exactly how it's solved!
Thank you so much for your help!
1 Answer
- oubaasLv 76 years ago
a)
just considering the sound speed :
d1 = 340*3 = 1020.000 m
b)
precise calculation :
d2 = 340*3(1+340/(300*10^6)) = 1020.0012 m
Even though you carry out the account taking care of the micro-delay introduced by the difference in time between striking and striking appearance to you the result is practically the same ; infact :
Δd = d2-d1 = 0.0012 m (1.2 mm) = 100*0.0012/1200.0012 = 0.00010 %
