A source of sound gives \(5\) beats per second when sounded with another source of frequency \(100\) per second. The second harmonic of the source, together with a source of frequency \(205\) per second, gives \(5\) beats per second. What is the frequency of the source?
1. \(95\) Hz
2. \(100\) Hz
3. \(105\) Hz
4. \(205\) Hz
Subtopic:  Beats |
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Two sitar strings, A and B, playing the note 'Ga,' are slightly out of tune and produce 6 Hz beats. The tension in the string A is slightly reduced, and the beat frequency is found to be reduced to 3 Hz. If the original frequency of A is 324 Hz, what is the frequency of B?

1. 316 Hz

2. 318 Hz

3. 319 Hz

4. 314 Hz

Subtopic:  Beats |
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A set of \(20\) tuning forks is arranged in a series of increasing frequencies. If each fork gives \(4\) beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of the last fork is:
1. \(152\) Hz
2. \(234\) Hz
3. \(134\) Hz
4. \(144\) Hz
Subtopic:  Beats |
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Two organ pipes closed at one end produce \(5\) beats per second in fundamental mode. If the ratio of their lengths is \(10:11\), then their frequencies (in Hz) are:

1. \(55,50\) 2. \(105,100\)
3. \(75,70\) 4. \(100,95\)
Subtopic:  Beats |
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Two sound waves given by the equations \(y=A\sin 122 \pi t\) and \(y=A\sin 128 \pi t\) pass through a point simultaneously. The number of beats per second is:

1. \(6\) 2. \(5\)
3. \(4\) 4. \(3\)
Subtopic:  Beats |
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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 |
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From NCERT
AIPMT - 2013
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A student tunes his guitar by striking a \(120~\text{Hz}\) with a tuning fork and playing the \(4^{th}\) string at the same time. By keen observation, he hears the amplitude of the combined sound oscillating thrice per second. Which of the following frequencies is most likely the frequency of the \(4^{th}\) string on his guitar?
1. \(130\)
2. \(117\)
3. \(110\)
4. \(120\)

Subtopic:  Beats |
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Two wires, A and B, of a musical instrument 'Sitar' produce 3 beats per second. If the tension of B is raised, the number of beats becomes 1 beat per second. If the frequency of A is 450 Hz, then the original frequency of B will be:

1. 447 Hz

2. 453 Hz

3. 449 Hz

4. 451 Hz

Subtopic:  Beats |
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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 |
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AIPMT - 2006
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Tuning fork \(F_1\) has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork \(F_2\). When \(F_2\) is loaded with wax, it still produces 6 beats/second with \(F_1\). The frequency of \(F_2\) before loading was:
1. 253 Hz
2. 262 Hz
3. 250 Hz
4. 259 Hz

Subtopic:  Beats |
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