How does sound of a heart beat reaches the doctor's ears with the help of a stethoscope?

Due to single reflection of sound.

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Due to refraction of sound.

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Due to multiple reflection of sound.

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Due to production of an echo.

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Solution

The correct option is C Due to multiple reflection of sound.
Stethoscope is an instrument used to listen to the heart beat. The sound of heart beat reahes the doctor's ears due to multiple refelction of sound, as it passes through the stethoscope.

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