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When a source of sound passes us , wheth...

When a source of sound passes us , whether it be a car horn or a train whistle , the pitch we hear goes from high to low . Explain why ? Use any relation to support your explanation .

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The predominant sound waves used in human speech have wavelengths in the range from 1.0 to 3.0 meters. Using the ideas of diffraction, explain how it is possible to hear a person's voice even when he is facing away from you.