## anonymous one year ago A fire truck with its siren blowing passes you. What happens to the sound of its siren as the truck moves away from you? A. the pitch gets higher B. the pitch gets lower C. the amplitude gets higher D. the amplitude gets lower

1. Michele_Laino

here the Doppler effect is involved

2. anonymous

ok! what does that mean? :/ pitch gets lower?

3. Michele_Laino

since the source of the sound is going away from me, then the received frequency from me, is less than the emitted frequency by the truck

4. anonymous

ohh so the solution should be amplitude is lower? choice D?

5. Michele_Laino

I think that the answer is the pitch gets higher, since we have the subsequent relationship between wave length and frequency: $\Large \lambda = \frac{v}{\nu }$ where v is the speed of sound

6. anonymous

ohhh okay! makes sense :) thank you!!!

7. Michele_Laino

:)