On which principle does a megaphone work?

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Reflection of sound

Refraction

Multiple reflections

None of the above

answer is A.

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Detailed Solution

A megaphone works on the principle of reflection of sound.
Megaphones are made to guide sound in a certain direction while preventing its dispersion in all directions. In these devices, sound waves are successively reflected by a tube and a conical orifice, which directs most of the sound waves from the source forward toward the listener.

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