The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencies, when :

1. Two sources are vibrating in opposite phase

2. The amplitude of the two sources are equal

3. At the point of observation, the amplitudes of two S.H.M. produced by two sources are equal and both the S.H.M. are along the same straight line

4. Both the sources are in the same phase

Subtopic:  Speed of Sound |
 50%
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Two sound waves (expressed in CGS units) given by y1=0.3sin2πλ(vtx) and y2=0.4sin2πλ(vtx+θ) interfere. The resultant amplitude at a place where the phase difference is π/2 will be :

(1) 0.7 cm

(2) 0.1 cm

(3) 0.5 cm

(4) 1107cm

Subtopic:  Wave Motion |
 86%
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If two waves having amplitudes 2A and A and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be 

1. 3A

2. 5A

3. 2A

4.  A

Subtopic:  Wave Motion |
 56%
From NCERT
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The intensity ratio of the two waves is 1 : 16. The ratio of their amplitudes is 

(1) 1 : 16

(2) 1 : 4

(3) 4 : 1

(4) 2 : 1

Subtopic:  Speed of Sound |
 91%
From NCERT
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The superposing waves are represented by the following equations : y1=5sin2π(10t0.1x), y2=10sin2π(20t0.2x) Ratio of intensities ImaxImin will be :

(1) 1

(2) 9

(3) 4

(4) 16

Subtopic:  Wave Motion |
 82%
From NCERT
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The displacement of a particle is given by x=3sin(5πt)+4cos(5πt). The amplitude of the particle is :

(1) 3

(2) 4

(3) 5

(4) 7

Subtopic:  Wave Motion |
 87%
From NCERT
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The two interfering waves have intensities in the ratio 9 : 4. The ratio of intensities of maxima and minima in the interference pattern will be :

(1) 1 : 25

(2) 25 : 1

(3) 9 : 4

(4) 4 : 9

Subtopic:  Wave Motion |
 89%
From NCERT
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If the ratio of amplitude of two waves is 4 : 3. Then the ratio of maximum and minimum intensity will be :

(1) 16 : 18

(2) 18 : 16

(3) 49 : 1

(4) 1 : 49

Subtopic:  Wave Motion |
 90%
From NCERT
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Equation of motion in the same direction is given by y1=Asin(ωtkx), y2=Asin(ωtkxθ). The amplitude of the medium particle will be 

1. 2Acosθ2

2. 2Acosθ

3. 2Acosθ2

4. 1.2f,1.2λ

Subtopic:  Wave Motion |
 62%
From NCERT
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The displacement of the interfering light waves are y1=4sinωt and y2=3sinωt+π2. What is the amplitude of the resultant wave :

(1) 5

(2) 7

(3) 1

(4) 0

Subtopic:  Wave Motion |
 91%
From NCERT
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