On which principle does the megaphone work?

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Principle of mutual induction

Principle of sound

Reflection of sound

Sonar

answer is C.

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Detailed Solution

The megaphone work on the principle of reflection of sound.
The megaphone is a device used to increase sound's loudness and direct the sound produced in a particular direction. The sound enters the megaphone through a narrow end and emerges from a wider end. The sound is reflected multiple inside the megaphone, and the echoes overlap each other to produce a much louder sound.

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