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: Â Beats |
Â 82%
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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: Â Beats |
Â 77%
From NCERT
AIPMT - 2013
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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: Â Beats |
Â 70%
From NCERT
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