1. In the following diagram, will a person at point "A" hear a higher or lower frequency than 350 Hz? Why? A Ambulance is travelling in this direction Ambulance with f,=350Hz 2. What would the ambulance have to be doing so the person will hear a frequency equal to 350 Hz? 3. A car horn has a frequency of 480 Hz and the car is moving at 25 m/s. The speed of sound in air is 334 m/s. Find the apparent frequency detected by an observer when the car is moving away from them.