Question

Sound travels about 700 miles per hour. If you stand in a canyon and sound a horn, you will hear an echo.

Suppose it takes about 0.5 seconds to hear the echo. How far away is the canyon wall, in feet? Round your answer to one decimal place.

Answer 1

Speed of sound = 700 miles per hour = 700 miles per 3600 sec = 7miles per 36 sec

Speed of sound = Wavelenght × 1/Time

7/36 = Wavelenght × 2/0.5

Wavelenght = 7/36 × 1/4 = 0.0486111111 miles

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