A narrow sound pulse (for example, 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 20s, i.e. the whistle is blown for a split second after every 20 second, is the frequency of the note produced by the whistle equal to `1//20=0.05Hz?`

Explanation

(a) A short pip by a 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.` Rather 0.05 Hz is the frequency of repetition of the short pip of the whistle.