Megaphone and stethoscope work on which principle of the sound?

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Reflection of the sound

Reverberation

Persistence

absorption

answer is A.

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Detailed Solution

Megaphones and stethoscopes work on the principle of reflection of sound.
A megaphone is a cone-shaped device that magnifies the sound typically used to address a large audience.
A stethoscope is a medical instrument used to examine patients physically. It is used to hear the sound of the heartbeat of the patient. It works on the principle of the multiple reflections of the sound. A thin fibre is attached at one end of the stethoscope, which vibrates by the reflection of the sound wave of the heartbeat. On the other end of the stethoscope, this sound can be heard.
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