Tc = 35 7) On a very hot day of 350 C, a firetruck is on its way to a fire. The siren is designed to emit at a power output of P - 10 Watts and a frequency of fsource - 3000 Hz. You are standing still and the truck is moving towards you. You happen to have your handy-dandy oscilloscope app on your phone, and you measure a frequency of fo - 3300 Hz for the siren. a) What is the speed of sound in air that day? b) What is the sound intensity I at your location when the fire truck passes you at r = 1 m from your location? Hint: I- P / 4xr2, where 4xr is the surface area of a spherical shell distance r from the truck. c) What is the sound intensity level S of the siren just as the firetruck passes you? d) What is the speed vsource of the firetruck as it approaches you? e) What will be the frequency fo you hear of the siren as it moves away from you