A source of unknown frequency gives \(4\) beats/s when sounded with a source of known frequency of \(250~\text{Hz}\). The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency of \(513~\text{Hz}\). The unknown frequency will be:

1. \(246~\text{Hz}\) 2. \(240~\text{Hz}\)
3. \(260~\text{Hz}\) 4. \(254~\text{Hz}\)
Subtopic:  Beats |
 77%
From NCERT
AIPMT - 2013
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Two sources of sound placed close to each other, are emitting progressive waves given by,
\(y_1=4\sin 600\pi t\) and \(y_2=5\sin 608\pi t\).
An observer located near these two sources of sound will hear:

1. \(4\) beats per second with intensity ratio \(25:16\) between waxing and waning
2. \(8\) beats per second with intensity ratio \(25:16\) between waxing and waning
3. \(8\) beats per second with intensity ratio \(81:1\) between waxing and waning
4. \(4\) beats per second with intensity ratio \(81:1\) between waxing and waning

Subtopic:  Beats |
 60%
From NCERT
AIPMT - 2012
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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. 0.01

2. 0.02

3. 0.03

4. 0.04

Subtopic:  Beats |
 62%
From NCERT
AIPMT - 2011
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A tuning fork of frequency \(512\) Hz makes \(4\) beats/s with the vibrating string of a piano. The beat frequency decreases to \(2\) beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was:
1. \(510\) Hz
2. \(514\) Hz
3. \(516\) Hz
4. \(508\) Hz

Subtopic:  Beats |
 70%
From NCERT
AIPMT - 2010
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Each of the two strings of lengths 51.6 cm and 49.1 cm is tensioned separately by 20 N of force. The mass per unit length of both strings is the same and equals 1 g/m. When both the strings vibrate simultaneously, the number of beats is:

1. 5 2. 7
3. 8 4. 3
Subtopic:  Beats |
 56%
From NCERT
AIPMT - 2009
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Two sound waves with wavelengths 5.0 m and 5.5 m, respectively, propagate in gas with a velocity of 330 m/s. How many beats per second can we expect?

1. 12

2. 0

3. 1

4. 6

Subtopic:  Beats |
 75%
From NCERT
AIPMT - 2006
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