A device based on multiple reflection used for sending amplified sound in a particular direction is:

Bulb horn

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Megaphone

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Ear trumpet

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Solution

The correct option is B Megaphone
Megaphone is based on multiple reflection of sound. It's purpose is to increase the loudness of sound and amplify it by multiple reflection of sound on inside surfaces.It is a horn shaped tube designed to send amplified sound in a particular direction. It is also called Loud hailer.

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