Aconvertible with the top down is traveling north on a road at a speed of 23.0 m/s. an ambulance, traveling south at a speed of 42.0 m/s, approaches with its siren producing sound at a frequency of 2600 hz. (enter your answers in hz. assume that the speed of sound in air is 343 m/s.) (a) what frequency does the driver of the convertible observe as the ambulance approaches? (enter your answer to the nearest integer.) hz (b) what frequency does the driver of the convertible detect after the ambulance passes her? hz (c) repeat parts (a) and (b) for the case when the ambulance is traveling northbound. while ambulance overtakes hz after ambulance passes