On which principle does the stethoscope work?

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Principle of mutual induction

Ultrasound

Multiple reflections of sound

Sonar

answer is C.

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Detailed Solution

The stethoscope works on the principle of multiple reflections of sound.
The stethoscope is a device that hears very low sound levels inside a body. When the stethoscope's diaphragm is placed over a body, small vibrations are produced, producing waves of sound inside the tube. The sound travels through the tube, undergoing multiple reflections, and when it reaches the earpiece, the sound becomes loud and clear.

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