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In Stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ears by -

Correct Answer: B. Multiple reflection of sound

Explanation: Multiple Reflection of Sound : When sound waves are reflected again and again (not just once) from surfaces and travel inside a medium, it is called multiple reflection of sound. Examples : Stethoscope – The sound of heartbeat/lungs reflects many times inside the tube, so the doctor hears it clearly. Loudspeaker / Megaphone / Horn / Trumpet – Multiple reflections direct the sound in one direction, making it louder. Shehnai / Flute – Sound waves reflect repeatedly inside the instrument to produce music. Sound boards in auditoriums – Set up to send sound clearly to the entire hall.

RAS 2021MediumBasics of Everyday Science

In Stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ears by -

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