Question

You are driving at 25 m/s when an ambulance passes you and pulls into your lane, just in front of you, and speeds ahead at 35 m/s. The ambulance driver hears a siren sound of 850 Hz. What frequency do you hear

Answer 1

The value is
`f_1 = 828 \ Hz`

Step-by-step explanation:

From the question we are told that

The speed is
`v = 25 \ m/s`

The speed of the ambulance is
`u = 35 \ m/ s`

The frequency of the siren is
`f = 850 \ Hz`

Generally from Doppler effect equation we have that

`f_1 = (v_s - v )/( v_s + u ) * f`

Here
`v_s` is the velocity of sound with the value
`v_s = 343 \ m/s`

=>
`f_1 = (343 - 25 )/( 343 + 35 ) * 850`

=>
`f_1 = 828 \ Hz`