Two sound waves of slightly different frequencies propagating in the same direction produce beats due to
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(a) Beats are produced on account of interference of sound waves of slightly different frequencies.
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A wave travels uniformly in all directions from a point source in an isotropic medium. The displacement of the medium at any point at a distance $r$ from the source may be represented by ($A$ is a constant representing strength of source)
The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If length of the open pipe is $60 \mathrm{~cm}$, the length of the closed pipe will be :
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