A narrow sound pulse ( for example, a short pip by a whistle ) is sent across a medium. (a) Does the puslehave a definite (I) frequency , (ii) wavelength, (iii) speed of propagation ?(b) If the pulse rate is 1 afterevery 20s ( that is the whistle blown for a split of second after every 20s) , is the frequency of the noteproduced by the whistle equal to 1// 20 or 0.05 H z ?

A narrow sound pulse ( for example, a short pip by a whistle ) is sent

1.	A narrow sound pulse ( for example, a short pip by a whistle ) is sent across a medium. (a) Does the puslehave a definite (I) frequency , (ii) wavelength, (iii) speed of propagation ?(b) If the pulse rate is 1 afterevery 20s ( that is the whistle blown for a split of second after every 20s) , is the frequency of the noteproduced by the whistle equal to 1// 20 or 0.05 H z ?
Answer» Solution :(a) A short PIP bya whistle has neither a definite WAVELENGTH nor a definite frequency. However its speed of propagation is fixed, being equal to speed of sound in air. (b) No, frequency of the NOTE produced by whistle is not `1// 20 =0.05Hz`. Rather0.05 Hz is the frequencyof repetition of the short pipe of the whistle.

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