Two whistles S1 and S2 emit steady notes of frequencies 420Hz and 432Hz respectively. At t=0, the sound at a listener’s position is a maximum.
(i) Calculate the total number of loud maxima the listener hears in the time interval from t=0 to t=7.5s.
(ii) Determine the earliest instant after t=0 at which the listener will hear the first minimum.
(iii) Find the exact time at which the fifth maximum after t=0 is heard.