# Problem: Suppose an oncoming ambulance moving at 115 km/h emits a steady 785-Hz sound from its siren.What frequency, in Hz, is received by a person watching the oncoming ambulance? The speed of sound on this day is 345 m/s

###### FREE Expert Solution

Let the speed of the sound be vw

Speed of the source be vs

The frequency received by the person as the ambulance approaches is expressed as:

$\overline{){{\mathbf{f}}}_{{\mathbf{o}}}{\mathbf{=}}{\mathbf{f}}\mathbf{\left(}\frac{{\mathbf{v}}_{\mathbf{w}}}{{\mathbf{v}}_{\mathbf{w}}\mathbf{-}{\mathbf{v}}_{\mathbf{s}}}\mathbf{\right)}}$

Converting 115 km/h

90% (75 ratings) ###### Problem Details

Suppose an oncoming ambulance moving at 115 km/h emits a steady 785-Hz sound from its siren.

What frequency, in Hz, is received by a person watching the oncoming ambulance? The speed of sound on this day is 345 m/s

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Sound Waves concept. You can view video lessons to learn Sound Waves. Or if you need more Sound Waves practice, you can also practice Sound Waves practice problems.