With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source

Question

Dr. Abubacker · Accepted Answer

(a) By using $n^{''} = n\left( \frac{v}{v - v_{S}} \right)$
$2n = n\left( \frac{v - v_{O}}{v - 0} \right) \Rightarrow v_{O} = - v = -$ (speed of sound)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound, as shown
[image:15_image56.png]

Q. With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source

Explanation

Reviewed by Dr. Abubacker

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