Stethoscope of doctors for finding quality, strength and frequency of human heart beat is based on the principle of

SONAR

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Reverberation

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Multiple reflection

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Echo

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Solution

The correct option is B Multiple reflection
Stethoscope of doctors for finding quality, strength and frequency of human heart beat is based on the principle of multiple reflection. In stethoscope, sound is received by chest piece and sent to the earpieces by multiple reflecting through a long tube

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