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Characteristics of Sound Waves

When a train ...

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When a train is approaching the stationary observer, the apparent frequency of the whistle observed as {100Hz , while when it has passed away from the observer { with same speed, it is 50Hz . Calculate the frequency of the whistle when the observer moves with the train {(V=330m/s){ (1) 33.3Hz 2) 50Hz 3) 66.6Hz 4) 75Hz

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Q. When a train approaches a stationary observer, the apparent frequency of the whistle is

n^{'}

and when the same train recedes away from the observer, the apparent frequency is

n^{''}

. Then, the apparent frequency

n

when the observer moves with the train is :

Q. When a train approaches a stationary observer, the apparent frequency of the whistle is n' and when the same train recedes away from the observer, the apparent frequency is n", Then the apparent frequency n when the observer sitting in the train is

Q. A train blows a whistle of frequency

640 H z

in air. Find the difference in apparent frequencies of the whistle for a stationary observer, when the train moves towards and away from the observer with the speed of

72 k m / h r

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= 340 m / s

Q. A train is moving with a uniform speed of 33 m/s and an observer is approaching the train with the same speed. If the train blows a whistle of frequency 1000 Hz and the velocity of sound is 333 m/s, then the apparent frequency of the sound that the observer hears is:

Q. When a source moves away from stationary observer with velocity v then apparent change in frequency is

Δ n_{1}

. When an observer approaches the stationary source with same velocity v then change in frequency is

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