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Q.

On which principle does the megaphone work?


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a

Principle of mutual induction

b

Principle of sound

c

Reflection of sound

d

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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