Which of the following is based on reflection of sound?

Megaphone
Soundboard
Stethoscope
All of these

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Solution

The correct option is D
All of these

(1) When sound waves strike on a surface and bounce back to the same medium then this type of phenomenon is called reflection of Sound.
(2) Megaphone, Soundboard, and Stethoscope are based on the application of reflection of sound.
(3) Hence option (d) all of these are the correct answer.

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