DOPPLER EFFECT!

this weekend, apparently there was a building close by whose fire alarm kept going off. it was so annoying and loud huhhhh. so as i sat in my room trying to do homework i heard the fire trucks coming and i thought PHYSICS! doppler effect :) i first heard the siren from a distance but it soon got closer and i could tell because the sound grew louder and the pitch higher. according to the doppler effect, as the sound source approaches the listener, the frequency of the sound waves increase causing the pitch to be higher. since the source is moving towards me, the listener, i can calculate the frequency perceived by me through the equation: fl=fs(1/(1-vs/v)) alrighty the end!