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5 November, 12:35

Two loudspeakers are placed side by side and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear

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  1. 5 November, 12:40
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    0.68 m

    Explanation:

    We know that the speed of sound in air is a product of frequency and wavelength. Taking speed of sound in air as 340 m/s

    V=frequency*wavelength

    Then wavelength is given by 350/500=0.68 m

    Therefore, to repeat constructive interference at the listener's ear, a distance of 0.68 m is needed
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