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The range of human hearing extends from approxmately 20 HZ to 20 000 HZ. Find the wavelenghts of these extremes when the speed of sound in air is equal to 343 m/s.

A dolphin is 25 degrees C sea water emits a sound directed toward the bottom of the ocean 150 m below. How much time passes before it hears an echo?

  • physics -

    1. L = V*T = 343m/s * (1/20)s. = 17.2 m.

    L = 343m/s * (1/20000)s. = 0.0172 m.

    2. d = 2 * 150m = 300 m. = Tot. dist.
    T = d/V = 300/343 = 0.88 s.

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