Question

4 A car horn has a frequency of 400 Hz. The car is moving away from an

intersection at 8 m/s. The frequency heard by a woman standing at the
intersection could be

Answer 1

f = 409.6 Hz, the woman hears a higher frequency sound

Step-by-step explanation:

This is a Doppler effect problem, which is described by the equation for the case of a fixed observer

f = fo
`(v)/(v \pm v_s)`

where the negative sign is for the source approaching the observer

in this case the car is the one that emits the sound and moves away from the intersection

let's calculate

f = 400
`(343)/(343-8)`

f = 409.6 Hz

therefore the woman hears a higher frequency sound