The stethoscope used by doctors works on the principle of

Refraction of sound

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Reflection of sound

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Interference of sound

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Absorption of sound

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Solution

The correct option is B Reflection of sound
A stethoscope has an air filled tube with a diaphragm at its one end . When this diaphragm is placed on the chest of a patient , it vibrates due to faint sound coming from the chest , these vibrations are channelised through the air filled tube and amplified by multiple reflections by the inner walls of the tube , thus it is based on the principle of reflection .

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Stethoscope works on principle of multiple reflections of sound.

Doctors use stethoscope to hear the sound produced during each cardiac cycle. The second sound is heard when:

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