The intensity of a sound appears to an observ | vedclass

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(D) The phenomenon where the intensity of sound varies periodically in time is known as $beats$. $Beats$ occur when two sound waves of slightly differ

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The source is producing a sound composed of two nearby frequencies

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(D) The phenomenon where the intensity of sound varies periodically in time is known as $beats$. $Beats$ occur when two sound waves of slightly different frequencies, $f_1$ and $f_2$, interfere with each other. The resulting intensity varies with a frequency equal to the difference of the two frequencies, $|f_1 - f_2|$. Additionally, if the source intensity itself is modulated periodically, the observer will perceive a periodic change in intensity. Comparing this with the given options, option $D$ describes the physical condition for $beats$, which is a standard cause for periodic intensity variation.

The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?

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