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20 February, 21:28

A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C.

How far away is the mountain that reflected the sound wave? At this altitude, the speed of sound in air at 273 K is 327 m/s.

Answer in units of m.

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Answers (1)
  1. 21 February, 00:23
    0
    560 m

    Explanation:

    The speed of sound in air is approximately:

    v ≈ v₀ + 0.6T

    where v₀ is the speed of sound at 0°C (273 K) in m/s, and T is the temperature in Celsius.

    The speed of sound at 20°C at that altitude is:

    v ≈ 327 + 0.6 (20)

    v ≈ 339 m/s

    The sound travels from the hikers to the mountain and back again, so it travels twice the distance.

    339 m/s = 2d / 3.3 s

    2d = 1118.7 m

    d = 559.35 m

    Rounding, the mountain is approximately 560 m away.
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