How fast is the sedan?

Classical Mechanics Level 2

In the above diagram, an ambulance moving at a constant speed of 20 m/s 20 \text{ m/s} generates a sound of frequency 1080 Hz . 1080 \text{ Hz}. Calvin is chasing the ambulance in his sedan at a constant speed. If the frequency of the sound measured by Calvin from his car is 1050 Hz , 1050 \text{ Hz}, then what is the speed of Calvin's sedan?

The speed of sound in the air is 340 m/s . 340 \text{ m/s}.

15.0 15.0 m/s 10.0 10.0 m/s 5.0 5.0 m/s 20.0 20.0 m/s

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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1 solution

Venture Hi
Mar 19, 2014

1050=((340+V)/(340+20))*1080

http://formulas.tutorvista.com/physics/doppler-shift-formula.html

2 Helpful 0 Interesting 0 Brilliant 0 Confused

if your speed was 10m/s, then you would probably hear the sound into its descending frequency... remember for the constant speed.. so I think its still 20m/s and only the distance matters..

Mon Leyson - 7 years, 2 months ago

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