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  4. Three sources of equal intensities with frequencies 400,401 and 402 vib/s are sounded together. The number of beat/s is

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Q. Three sources of equal intensities with frequencies $400,401$ and $402\, vib/s$ are sounded together. The number of beat/s is

J & K CETJ & K CET 2005Electromagnetic Waves

Solution:

Beats are the periodic and repeating fluctuations heard in the intensity of sound, when two sound waves of very similar frequencies interfere with one another.
Beats = difference in frequencies.
Maximum-number of beats $ =402-400=2 $