Dual sound source

Classical Mechanics Level 2

In the above diagram, a sound source producing a sound of frequency $f$ is moving at a constant speed of $v_s$ to the right (in the direction of the red arrow). Let $f_A$ and $f_B$ be the frequencies detected by the sound detectors $A$ and $B,$ respectively. What is the ratio $f_A:f_B$ ?

The speed of sound ( $v$ ) in the air is $340 \text{ m/s}$ and $v > v_s$ .

\frac{1}{v-v_s}:\frac{1}{v+v_s}

\frac{v+v_s}{v-v_s}:\frac{v-v_s}{v+v_s}

\frac{v-v_s}{v+v_s}:\frac{v+v_s}{v-v_s}

\frac{1}{v+v_s}:\frac{1}{v-v_s}

1 solution

Arghyanil Dey
May 1, 2014

Only an application of Doppler's effect

Dual sound source

1 solution

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