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Question 12.S&C.3: 1. Do compressions and rarefactions in a sound wave travel i...

1. Do compressions and rarefactions in a sound wave travel in the same direction or in opposite directions from one another?

 

2. What is the approximate distance of a thunderstorm when you note a 3-s delay between the flash of lightning and the sound of thunder?

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1. They travel in the same direction.

2. Assuming the speed of sound in air is about 340 m/s, in 3 s it will travel 340 m/s\times 3 s = 1020 m. There is no appreciable time delay for the flash of light, so the storm is slightly more than 1 km away.

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