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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) frequency, (ii) wavelength, (iii) speed of propagation?
(b) If the pulse rate is 1 after every $20 \mathrm{~s}$, (that is the whistle is blown for a split of second after every $20 \mathrm{~s}$ ), is the frequency of the note produced by the whistle equal to $1 / 20$ or $0.05 \mathrm{~Hz}$ ?
(a) Does the pulse have a definite :
(i) frequency, (ii) wavelength, (iii) speed of propagation?
(b) If the pulse rate is 1 after every $20 \mathrm{~s}$, (that is the whistle is blown for a split of second after every $20 \mathrm{~s}$ ), is the frequency of the note produced by the whistle equal to $1 / 20$ or $0.05 \mathrm{~Hz}$ ?
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Verified Answer
(a) A narrow sound pulse such as a short pip by a whistle does not have a definite wavelength or frequency. But being a sound wave, it has a definite speed (in a non-dispersive medium).
(b) No, the frequency of the note produced by the whistle is not equal to $1 / 20$ or $0.05 \mathrm{~Hz}$, it is only the frequency at which the pulse gets repeated.
(b) No, the frequency of the note produced by the whistle is not equal to $1 / 20$ or $0.05 \mathrm{~Hz}$, it is only the frequency at which the pulse gets repeated.
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