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Two tuning forks A and B lying on opposi...

Two tuning forks `A` and `B` lying on opposite sides of observer 'O' and of natural frequency `80 Hz` move with velocity `10 m//s` relative to stationary observer `O`. Fork `A` moves away from the observer while the fork `B` moves towards him. A wind with a speed `10 m//s` is blowing in the direction of motion of fork `A`. Find the beat frequency measured by the observer in Hz. [Take speed of sound in air as `340 m//s`].

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