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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 $\mathbf{1} / \mathbf{2 0}$ or $\mathbf{0} .05 \mathrm{~Hz}$ ?
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 $\mathbf{1} / \mathbf{2 0}$ or $\mathbf{0} .05 \mathrm{~Hz}$ ?
CBSE | Class 11 | NCERT | Physics | Waves
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 $\mathbf{1} / \mathbf{2 0}$ or $\mathbf{0} .05 \mathrm{~Hz}$ ?

(a) The speed of propagation is known, and it is the same as the speed of sound in air. The wavelength and frequency of the signal will be uncertain.

(b) The note emitted by a whistle does not have a frequency of $1 / 20=0.05 Hz$. The frequency of repetition of the brief pip of the whistle, however, is $0.05 Hz$.

i

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