A device based on multiple reflection used as hearing aid.

bulb horn

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ear trumpet

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megaphone

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Solution

The correct option is B ear trumpet
Ear trumpet or hearing aid is used by the persons who are hard of hearing. The sound waves received by the wide end of the trumpet are reflected into a much narrower area.

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Similar questions

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

Name a device which is used to produce changing patterns or sequences by means of multiple reflections.

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