3. Ann was sitting on a bench near the highway, then suddenly she heard a siren coming with a frequency of 684 Hz and moving towards her at 2 m/s. What will be the frequency that Ann will detect as the siren approach her?
Added by Akhira R.
Step 1
First, we need to find the speed of sound in air. The speed of sound in air is approximately 343 m/s. Show more…
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Key Concepts
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You are in an auto traveling at $25.0 \mathrm{m} / \mathrm{s}$ toward a pole-mounted warning siren. If the siren's frequency is $365 \mathrm{Hz}$, what frequency do you hear? Use $343 \mathrm{m} / \mathrm{s}$ as the speed of sound.
Sound
Properties and Detection of Sound
(a) What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800-Hz sound from its siren? The speed of sound on this day is 345 m/s. (b) What frequency does she receive after the ambulance has passed?
An ambulance traveling at $44 \mathrm{m} / \mathrm{s}$ approaches a car heading in the same direction at a speed of $28 \mathrm{m} / \mathrm{s}$. The ambulance driver has a siren sounding at $550 \mathrm{Hz}$. At what frequency does the driver of the car hear the siren?
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