A train traveling at 25 m/s is blowing its whistle at 440 Hz as it crosses a level crossing. You are waiting at the crossing and hear the pi

Question

A train traveling at 25 m/s is blowing its whistle at 440 Hz as it crosses a level crossing. You are waiting at the crossing and hear the pitch of the whistle change as the train passes you. The sound you hear changes from a frequency of to a frequency of _ _(Take the speed of sound to be 340 m/s.)

a. 410 Hz, 475 Hz
b. 472 Hz, 408 Hz
c. 408 Hz, 472 Hz
d. 475 Hz, 410 Hz

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Minh Khuê 3 years 2021-07-27T21:51:11+00:00 1 Answers 6 views 0

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  1. quangkhai
    0
    2021-07-27T21:52:21+00:00
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    Answer:

    b) 472HZ, 408HZ

    Explanation:

    To find the frequencies perceived when the bus approaches and the train departs, you use the Doppler’s effect formula for both cases:

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

    fo: frequency of the source = 440Hz

    vs: speed of sound = 343m/s

    vo: speed of the observer = 0m/s (at rest)

    v: sped of the train

    f: frequency perceived when the train leaves us.

    f’: frequency when the train is getTing closer.

    Thus, by doing f and f’ the subjects of the formulas and replacing the values of v, vo, vs and fo you obtain:

    f=f_o\frac{v_s-v}{v_s+v_o}=(440Hz)\frac{340m/s-25m/s}{340m/s}=408Hz\\\\f'=f_o\frac{v_s+v}{v_s-v_o}=(440Hz)\frac{340m/s+25m/s}{340m/s}=472Hz

    hence, the frequencies for before and after tha train has past are

    b) 472HZ, 408HZ

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