A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36km/h. He finds that traffic has eased and a car moving ahead of him at 18km/h is honking at a frequency of 1392Hz. If the speed of sound is 343m/s, the frequency of the honk as heard by him will be 

(a)1332Hz

(b)1372Hz

(c)1412Hz

(d)1454Hz 

Concept Questions :-

Doppler effect
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A wave travelling in the positive x-direction having maximum displacement along y-direction as 1m, wavelength 2π m and frequency of 1/π Hz is represented by

(a) y=sin(x-2t)

(b) y=sin(2πx-2πt)

(c) y=sin(10πx-20πt)

(d) y=sin(2πx+2πt)

Concept Questions :-

Types of waves
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If we study the vibration of a pipe open at both ends. then the following statements is not true

(a) Open end will be anti-node

(b) Odd harmonics of the fundamental frequency will be generated

(c) All harmonics of the fundamental frequency will be generated

(d) Pressure change will be maximum at both ends



Concept Questions :-

Standing waves
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A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is

(a) 254 Hz (b) 246 Hz (c) 240 Hz (d) 260 Hz

Concept Questions :-

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When a string is divided into three segments of lengths l1, l2 and l3, the fundamental frequencies of these three segments are v1, v2 and v3 respectively. The original fundamental frequency (v) of the string is 

(a) v=v1+v2+v3

(b) v=v1+v2+v3

(c) 1v=1v1+1v2+1v3

(d) 1v=1v1+1v2+1v3

Concept Questions :-

Travelling wave on string
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Two sources of sound placed close to each other, are emitting progressive waves given by

y1=4 sin 600πt and y2=5 sin 608 πt

An observer located near these two sources of sound will hear

(a)4 beats per second with intensity ratio 25:16 between waxing and waning

(b) 8 beats per second with intensity ratio 25:16 between waxing and waning

(c) 8 beats per second with intensity ratio 81:1 between waxing and waning

(d) 4 beats per second with intensity ratio 81:1 waxing and waning

Concept Questions :-

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The equation of a simple harmonic wave is 

given by 

          y=3 sinπ2(50t-x)

where x and y are in meters and t is in 

seconds. The ratio of maximum particle 

velocity to the wave velocity is

(a) 2π

(b) 32π

(c) 3π

(d) 23π

Concept Questions :-

Speed of sound
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A train moving at a speed of 220 ms-1

towards a stationary object, emits a sound 

of frequency 1000 Hz. Some of the sound 

reaching the object gets reflected back to 

the train as echo. The frequency of the echo

as detected by the driver of the train is

(speed of sound in air is 330 ms-1)

(a) 3500Hz

(b) 4000Hz

(c) 5000Hz

(d) 3000Hz

Concept Questions :-

Doppler effect
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Two waves are represented by the equations

y1=a sin (ωt+kx+0.57)m and

y2=a cos (ωt+kx)m, where x is in metre

and t in second. The phase difference between

them is

(a) 1.25 rad

(b) 1.57 rad

(c) 0.57 rad

(d) 1.0 rad

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Sound waves travel at 350 m/s through a warm 

air and at 3500 m/s through brass. The wavelength

of a 700 Hz acoustic wave as it enters brass from 

warm air :

(a) increases by factor 20

(b) increases by factor 10

(c) decreases by factor 20

(d) decreases by factor 10

Concept Questions :-

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