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

(1) 254 Hz

(2) 246 Hz

(3) 240 Hz

(4) 260 Hz

Subtopic:  Beats |
 75%
From NCERT
NEET - 2013
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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 

(1) v=v1+v2+v3

(2) v=v1+v2+v3

(3) 1v=1v1+1v2+1v3

(4) 1v=1v1+1v2+1v3

Subtopic:  Travelling Wave on String |
 79%
From NCERT
NEET - 2012
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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

Subtopic:  Beats |
 54%
From NCERT
NEET - 2012
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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

(1) 2π

(2) 32π

(3) 3π

(4) 23π

Subtopic:  Speed of Sound |
 80%
NEET - 2012
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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 an echo. The frequency of the echo as detected by the driver of the train is
(speed of sound in air is 330 ms-1)
1. 3500Hz
2. 4000Hz
3. 5000Hz
4. 3000Hz

Subtopic:  Doppler's Effect (OLD NCERT) |
 65%
From NCERT
NEET - 2012
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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?

(1) 1.25 rad

(2) 1.57 rad

(3) 0.57 rad

(4) 1.0 rad

Subtopic:  Wave Motion |
 61%
From NCERT
NEET - 2011
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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 :

(1) increases by factor 20

(2) increases by factor 10

(3) decreases by factor 20

(4) decreases by factor 10

Subtopic:  Wave Motion |
 76%
From NCERT
NEET - 2011
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Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to the occurrence of 6 beats/s when both the wires oscillate together would be:

1. 0.02 2. 0.03
3. 0.04  4. 0.01
Subtopic:  Beats |
 54%
From NCERT
NEET - 2011
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Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is :

(1)zero                                 

(2)2π3

(3)π                                     

(4)π6

Subtopic:  Wave Motion |
 55%
From NCERT
NEET - 2011
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A transverse wave is represented by y=A sin ωt-kx. For what value of the wavelength is the wave velocity equal to the maximum particle velocity?

(1) π A/2                                           

(2) π A

(3) 2 π A                                           

(4) A

Subtopic:  Types of Waves |
 83%
From NCERT
NEET - 2010
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