Two sound sources when sounded simultaneously produce four beats in 0.25 seconds. The difference in their frequencies must be :

(1) 4

(2) 8

(3) 16

(4) 1

Subtopic:  Beats |
 73%
From NCERT
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Two strings X and Y of a sitar produce a beat frequency 4 Hz. When the tension of the string Y is slightly increased the beat frequency is found to be 2 Hz. If the frequency of X is 300 Hz, then the original frequency of Y was :

(1) 296 Hz

(2) 298 Hz

(3) 302 Hz

(4) 304 Hz

Subtopic:  Beats |
 72%
From NCERT
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Two vibrating tuning forks produce progressive waves given by Y1=4sin500πt and Y2=2sin506πt. Number of beats produced per minute is :

(1) 360

(2) 180

(3) 3

(4) 60

Subtopic:  Beats |
 57%
From NCERT
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The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency :

(1) 10 Hz

(2) 360 Hz

(3) 216 Hz

(4) 6 Hz

Subtopic:  Standing Waves |
 58%
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The distance between the nearest node and antinode in a stationary wave is :

(1) λ

(2) λ2

(3) λ4

(4) 2λ

Subtopic:  Standing Waves |
 82%
From NCERT
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For the stationary wave y=4sinπx15cos(96πt), the distance between a node and the next antinode is :

1. 7.5

2. 15

3. 22.5

4. 30

Subtopic:  Standing Waves |
 74%
From NCERT
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The equation of a stationary wave is \(y = 0.8 ~cos\left(\frac{\pi x}{20}\right)sin200(\pi t)\), where \(x\) is in cm and \(t\) is in sec. The separation between consecutive nodes will be:

1. \(20~\text{cm}\)

2. \(10~\text{cm}\)

3. \(40~\text{cm}\)

4. \(30~\text{cm}\)

Subtopic:  Standing Waves |
 76%
From NCERT
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A wave represented by the given equation y=acos(kxωt) is superposed with another wave to form a stationary wave such that the point x = 0 is a node. The equation for the other wave is :

(1) y=asin(kx+ωt)

(2) y=acos(kx+ωt)

(3) y=acos(kxωt)

(4) y=asin(kxωt)

Subtopic:  Standing Waves |
 55%
From NCERT
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A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 Å between them. The wavelength of the standing wave is :

1. 1.21 Å

2. 2.42 Å

3. 6.05 Å

4. 3.63 Å

Subtopic:  Standing Waves |
 79%
From NCERT
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In stationary waves, the distance between a node and its nearest antinode is 20 cm. The phase difference between two particles having a separation of 60 cm will be :

(1) Zero

(2) π/2

(3) π

(4) 3π/2

Subtopic:  Standing Waves |
 81%
From NCERT
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