$A$ 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 $20 \; s$,(that is,the whistle is blown for a split of a second after every $20 \; s$),is the frequency of the note produced by the whistle equal to $1/20$ or $0.05 \; Hz$?

(N/A) $(i)$ No,a narrow pulse is not a periodic wave and does not have a single definite frequency.
$(ii)$ No,because it lacks a definite frequency,it does not have a definite wavelength.
$(iii)$ Yes,the pulse travels through the medium at the speed of sound characteristic of that medium.
$(b)$ No,the frequency of the note produced by the whistle is not $0.05 \; Hz$. The value $0.05 \; Hz$ represents the frequency of repetition of the pulse (the rate at which the whistle is blown),not the frequency of the sound wave itself.