contestada

Sound travels about 750 miles per hour. If you stand in a canyon and sound a horn, you will hear an echo. Suppose it takes about 3 seconds to hear the echo. How far away is the canyon wall, in feet?

Respuesta :

Explanation:

It is given that,

Speed of sound, v = 750 miles per hour

Since, 1 miles/hour = 1.46 foot/second

So, the speed of sound, v = 1100 feet/second

It takes about 3 seconds to hear the echo, t = 3 seconds. Let the canyon wall is d feet away. It can be calculated as :

[tex]d=v\times t[/tex]

[tex]d=1100\ ft/s\times 3\ s[/tex]

d = 3300 feet

Echo is the repetition of sound. So, the canyon wall is 3300/2 = 1650 feet away. Hence, this is the required solution.