g PRACTICE ANOTHER Two trains approach each other on separate but adjacent tracks. Train 1 is traveling at a speed of 30.3 m/s and train 2 a

Question

g PRACTICE ANOTHER Two trains approach each other on separate but adjacent tracks. Train 1 is traveling at a speed of 30.3 m/s and train 2 at a speed of 22.5 m/s. If the engineer of train 1 sounds his horn which has a frequency of 520 Hz, determine the frequency of the sound heard by the engineer of train 2. (Use 343 m/s as the speed of sound. Enter your answer to the nearest Hz.)

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Huyền Thanh 3 years 2021-08-07T21:04:22+00:00 1 Answers 15 views 0

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  1. thachthao
    0
    2021-08-07T21:05:52+00:00
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    Answer:

      f’= 607.8 Hz

    Explanation:

    This is a Doppler effect exercise due to the relative velocity of the sound source and the observer.

    By the time the source and the observer are getting closer the expression is

             f ’=f_o \ \frac{ v+ v_o}{v - v_s}

    where vs is the speed of the source, vo is the speed of the observer, if the bodies move away the signs are exchanged

    in this case, train 1 emits sound, so its speed is v_s = 30.3 m / s and train 2 is the receiver of the sound v₀ = 22.5 m / s

    let’s calculate

              f ’= 520 \ ( \frac{343 + 22.5}{343 - 30.3} )520 (343+ 22.5 / 343 – 30.3)

              f’= 607.8 Hz

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