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A narrow sound pulse (for example, a sho...

A narrow sound pulse (for example, a short pip by a whistle) is sent across a medium. (a) Does the pulse have a definite (i) wavelength, (ii) frequency, (iii) speed of propagation ? (b) If the pulse rate is `1` after every `20 s`, (i.e. the whistle is blown for a split second after every `20 s`) is the frequency of the note produced by the whistle equal to `(1)/(20) = 0.05 Hz` ?

Text Solution

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(a) A short pip by a whistle does not have a definite wavelength or frequency, but has a definite speed of propagation (in a non-disperive medium).
(b) The frequency of the note produced by the whislte is not equal to `(1)/(20)` = 0.05 Hz. Rather 0.05 Hz is only the frequency of repetition of the short pip by a whistle.
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