The siren on an ambulance is emitting a sound whose frequency is 2450 hz. the speed of sound is 343 m/s. if the ambulance is stationary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear?

Explanation:

It is given that,

Frequency of the siren, f = 2450 Hz

The speed of sound, v = 343 m/s

Here, both ambulance and the observer is stationary. The observed frequency is calculated using Doppler's effect as :

is the velocity of observer

is the velocity of source

v is the speed of sound wave

Here,

So, f' = f

f' = 2450 Hz

Wavelength,

So, the frequency and wavelength of the observed sound is 2450 Hz and 0.14 meters. Hence, this is the required solution.

your answer is c! hope this : )