2) (a) What frequency is received by a person watching an oncoming ambulance moving at130km/hand emitting a steady833Hzsound from its siren? The speed of sound on this day is345 m/s. ____ Hz (b) What frequency does she receive after the ambulance has passed? ____Hz

3)You set a tuning fork into vibration at a frequency of 743 Hz and then drop it off the roof of the Physics building where the acceleration due to gravity is 9.80 m/s². Determine how far the tuning fork has fallen when sound waves emitted by the tuning fork in the upward direction (i.e. back toward you) have a frequency of 719 Hz? (Take the speed of sound in air to be 343 m/s.)

____m