A stationary source (see figure) emits s...

A stationary source (see figure) emits sound waves of frequency f towards a stationary wall. If an observer moving with speed u in a direction perpendicular to the wall measures a frequency `f'=(11)/(8)f` at the instant shown, then u is related to the speed of sound `V_s` as

`3/4V_s`

`3/8V_s`

`1/4V_s`

`8/3V_s`

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