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Q.

The tool/instrument that is ineffective against multiple sound wave reflections is:

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a

Megaphone

b

Soundboard

c

Guitar

d

Stethoscope

answer is C.

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Detailed Solution

The tool/instrument that is ineffective against multiple sound wave reflections is a guitar 

All of the mentioned instruments—aside from the guitar—work with different sound reflections. 

Guitar works on the vibration of strings 

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