a. What frequency is received by a mouse just before being d…

а. Whаt frequency is received by а mоuse just befоre being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech оf frequency 3500 Hz? Take the speed of sound to be 331 m/s. b. A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. An observer waiting at the crossing receives a frequency of 208 Hz. What frequency does the observer receive as the train moves away?