A police car has an 850-Hz siren. It is traveling at 32 m/s on a day when the speed of sound through air is 342 m/s. The car approaches and passes an…

A police car has an 850-Hz siren. It is traveling at 32 m/s on a day when the speed of sound through air is 342 m/s. The car approaches and passes an observer who is standing along the roadside. What change in frequency does the observer hear?