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What is the frequency heard by a person driving at 15 m/s toward a blowing factory whistle (750 hz if the speed of sound is 343 m/s?

User Illya Doos
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1 Answer

3 votes

Answer:

= 784.30 Hz

Step-by-step explanation:

Using the formula;

f₀ =(v.fs)/(v-vp)

Where; f₀ is the observed frequency, v is the speed of sound in air, fs is the frequency of the source and vp is the speed of the person towards the whistle.

In this case;

Speed of sound in air = 343 m/s

Speed of the person towards the whistle = 15 m/s

Frequency of the source = 750 Hz

Therefore;

f₀ = (343 × 750)/ (343 -15)

= 784.30 Hz

User Joseph  Xu
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