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18 February, 15:44

A group of hikers hears an echo 2.90 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 341 m/s.)

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  1. 18 February, 18:43
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    494.45 m.

    Explanation:

    Echo: This is the sound heard after the reflection of sound wave in a plain surface.

    v = 2x/t ... Equation 1

    Where v = velocity of sound in air, x = distance between the mountain and the hikers, t = time to hear the echo.

    making x the subject of the equation,

    x = vt/2 ... Equation 2

    Given: v = 341 m/s, t = 2.9 s.

    Substitute into equation 2

    x = 341 (2.9) / 2

    x = 494.45 m.

    Hence the mountain is 494.45 m far away
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