Based on the background info, which person is located at position A, and who is located at position B, write a sentence and why you made your choice

Question

An ambulance is speeding down the road with its siren making a sound wave that has a frequency of 770hz. Bella is standing on the sidewalk listening to the ambulance approach her. Derek is sitting on a bench behind the ambulance and is listening to it drive away from him

Answer 1

Hi Mike O.,

Too bad the diagram didn't transmit along with (some of ) the text of the question. An object going away from the observer has a lower-frequency sound, an object coming towards the observer has a higher-frequency sound (relative to the sound heard on the object itself). That's the Doppler Effect, and you can easily detect it standing next to a high-speed motorway as vehicles go by, from aggregate motor and tire noise.