Awoman is sitting at a bus stop when an ambulance with a siren wailing at 317 hz approaches at 69 miles per hour (mph). assume the speed of sound to be 343 m/s. a) how fast is the ambulance moving in meters per second? (perform the necessary unit conversion) vs= 69 mph = m/s b) what frequency does the woman hear? fa = hz c) what speed (vs) would the ambulance be traveling in order for the woman to hear the siren at an approaching frequency of 350 hz? vs= m/s d) what frequency would she hear as the siren moves away from her at the same speed (as in part c)? fa = hz

a)30.67 m/s

b)348,12 Hz

c)32,34 m/s

d)289,69 Hz

Explanation:

a)

To convert 69 mph to m/s we have:

b)

For a resting receiver and an approaching source we have the following Doppler formula:

where is the source, and c is the speed of sound, f the perceived frequency and the frequency as perceived by the source. Plugging all the relevant values we get:

c)

Using the same formula as above and solving for we have:

d)

Now we have another Doppler formula for a source that is moving away from the receiver:

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

seeing the graph would