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Characteristics of Sound Waves

137.A man sta...

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137.A man standing on a platform observed that the frequency of the sound of a whistle emitted by a train drops by 140Hz. If the velocity of sound in air is 330m/s and the speed of the train is 70m/s ,the frequency of the whistle is A)571Hz B)800Hz C)400Hz D)260Hz

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Q. A man standing on a platform observe that the frequency of the sound of a whistle emitted by a train drops by

140 H z

. If the velocity of sound in air is

330 m / s

and the speed of the train is

70 m / s

, the frequency of the whistle is

Q. A man standing on a platform observes that the frequency of the sound of a whistle emitted by a moving train is less by

140 Hz

that the frequency emitted when the train is stationary. If the velocity of sound in air is

330 m/s

and the speed of the train is

70 m/s

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Q. A train approaching a railway platform with a speed of

20 m s^{- 1}

, starts blowing the whistle. Speed of sound in air is

340 m s^{- 1}

. If the frequency of the emitted sound from the whistle is

640 H z

, the frequency of sound to a person standing on the platform will appear to be:

Q. A man standing on a platform hears the sound of frequency 605 Hz coming from 550 Hz train whistle moving towards the platform. If the velocity of sound is 330 m/s. What is the speed of train?

Q. A train standing at the outer signal of railway station blows an whistle of frequency

400 H z

in still air. The train begins to move with speed of

30 m s^{- 1}

toward the platform. The frequency of the sound heard by an observer standing on the platform is
(Speed of sound in air

= 330 m s^{- 1}

)

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