Question

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?

Answer 1

Answer:

= 784.30 Hz

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