A source of sound and listener are approaching each other with a speed of 40 m/s. The apparent frequency of note produced by the source is 400 cps. Then, its true frequency (in cps) is (velocity of sound in air = 360 m/s

(1) 420

(2) 360

(3) 400

(4) 320

Concept Questions :-

Doppler effect
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A siren emitting sound of frequency 500 Hz is going away from a static listener with a speed of 50 m/sec. The frequency of sound to be heard, directly from the siren, is :

(1) 434.2 Hz

(2) 589.3 Hz

(3) 481.2 Hz

(4) 286.5 Hz

Concept Questions :-

Doppler effect
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A man sitting in a moving train hears the whistle of the engine. The frequency of the whistle is 600 Hz

(1) The apparent frequency as heard by him is smaller than 600 Hz

(2) The apparent frequency is larger than 600 Hz

(3) The frequency as heard by him is 600 Hz

(4) None of the above

Concept Questions :-

Doppler effect
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A whistle of frequency 500 Hz tied to the end of a string of length 1.2 m revolves at 400 rev/min. A listener standing some distance away in the plane of rotation of whistle hears frequencies in the range (speed of sound = 340 m/s

(1) 436 to 586

(2) 426 to 574

(3) 426 to 584

(4) 436 to 674

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A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17 m/s, the frequency registered is f2. If the speed of sound is 340 m/s then the ratio f1/f2 is

(1) 18/19

(2) 1/2

(3) 2

(4) 19/18

Concept Questions :-

Doppler effect
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If source and observer both are relatively at rest and if speed of sound is increased then frequency heard by observer will :

(1) Increases

(2) Decreases

(3) Can not be predicted

(4) Will not change

Concept Questions :-

Doppler effect
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A source and an observer move away from each other with a velocity of 10 m/s with respect to ground. If the observer finds the frequency of sound coming from the source as 1950 Hz, then actual frequency of the source is (velocity of sound in air = 340 m/s)

(1) 1950 Hz

(2) 2068 Hz

(3) 2132 Hz

(4) 2486 Hz

Concept Questions :-

Doppler effect
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A whistle revolves in a circle with an angular speed of 20 rad/sec using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer, which is far away from the centre in the same plane ?

(1) 333 Hz

(2) 374 Hz

(3) 385 Hz

(4) 394 Hz

Concept Questions :-

Doppler effect
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A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s)

(1) 733.3 Hz

(2) 644.8 Hz

(3) 481.2 Hz

(4) 286.5 Hz

Concept Questions :-

Doppler effect
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A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the observer before and after the passing of the car is 11 : 9. If the speed of sound is v, the speed of the car is

(1) $\frac{1}{10}v$

(2) $\frac{1}{2}v$

(3) $\frac{1}{5}v$

(4) v

Concept Questions :-

Doppler effect
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Difficulty Level: