The sound source of a ship’s sonar system operates at a frequency of 18.0 kHzkHz . The speed of sound in water (assumed to be at a uniform 2

Question

The sound source of a ship’s sonar system operates at a frequency of 18.0 kHzkHz . The speed of sound in water (assumed to be at a uniform 20∘C)∘C) is 1482 m/sm/s. The ship is at rest in the water.

(a) What is the wavelength of the waves emitted by the source?
(b) What is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling directly toward the ship at 4.95 m/s? The ship is at rest in the water.

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Thanh Hà 4 years 2021-09-04T16:54:09+00:00 1 Answers 14 views 0

Answers ( )

  1. yenoanh
    0
    2021-09-04T16:55:33+00:00
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    Answer:

    Explanation:

    a ) wave length of waves in water

    = velocity / frequency

    = 1482 / (18 x 1000)

    = .0823 m

    = 8.23 cm

    b ) Applying Doppler’s effect relation

    frequency of reflected wave

    = 18000 [ 1482 / (1482 – 4.95 ) ]

    = 18000 x 1.003385

    = 18061

    Difference in frequency= 61 Hz

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