In this figure shown BCD is an equilateral triangle of side length 1m A sound source of unknown frequency produce sound at A and

Question

In this figure shown BCD is an equilateral triangle of side length 1m A sound source of unknown frequency produce sound at A and minima is obtained at D The possible frequency of sound produced by source is speed of sound is 330 m s A 1 165 Hz 3 575 Hz D O 2 495 Hz 4 Both 1 and 2

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