Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20N force. Mass per unit length of both the strings is same and equal to 1 gm-1When both the strings vibrate simultaneously the number of beats is :

1. 5                                                   

2. 7

3. 8                                                   

4. 3

Subtopic:  Beats |
 59%
From NCERT
NEET - 2009
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Two periodic waves of intensities  I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and  minimum intensities is :

(1) I1+I2

(2) I1+I22

(3)I1-I22

(4) 2 I1+I2 

 

Subtopic:  Wave Motion |
 70%
From NCERT
NEET - 2008
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Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 s and the velocity of the wave is 300 m/s. What is the phase difference between the oscillations of two points?

(1) π3

(2) 2π3

(3) π

(4) π6

Subtopic:  Wave Motion |
 84%
From NCERT
NEET - 2008
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The wave described by y=0.25 sin(10πx-2πt), where x and y are in metres and t in seconds, is a wave traveling along the:

1. -ve x direction with frequency 1 Hz 
2. +ve x direction with frequency π Hz and wavelength λ =0.2 m 
3. +ve x direction with frequency 1 Hz and wavelength λ = 0.2 m
4. - ve x direction with amplitude 0.25 m and wavelength λ = 0.2 m


 

Subtopic:  Wave Motion |
 84%
From NCERT
NEET - 2008
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Two waves are represented by the equations y1=asinωt and y2=acosωt. The first wave 

(1) Leads the second by π

(2) Lags the second by 2π

(3) Leads the second by π2

(4) Lags the second by π2

Subtopic:  Wave Motion |
 61%
From NCERT
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The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is :

1. 10 cm/sec

2. 2.5 cm/sec

3. 5 cm/sec

4. 15 cm/sec

Subtopic:  Wave Motion |
 72%
From NCERT
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A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then the wavelength of the tone emitted is :

1. 0.56 m

2. 0.89 m

3. 1.11 m

4. 1.29 m

Subtopic:  Standing Waves |
 80%
From NCERT
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Sound waves have the following frequencies that are audible to human beings :

1. 5 c/s

2. 27000 c/s

3. 5000 c/s

4. 50,000 c/s

Subtopic:  Speed of Sound |
 71%
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The minimum audible wavelength at room temperature is about

1. 0.2 Å

2. 5 Å

3 5 cm to 2 metre

4. 20 mm

Subtopic:  Speed of Sound |
From NCERT
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The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is 

1.  2/7

2.  1/7

3.  3/5

4.  6/5

Subtopic:  Speed of Sound |
 51%
From NCERT
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