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: Â Beats |
Â 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: Â Beats |
Â 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: Â Beats |
Â 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: Â Beats |
Â 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: Â Beats |
Â 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: Â Beats |
Â 75%
From NCERT
AIPMT - 2006
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