Absorption coefficient can be measured by

Microphone

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Volume resonator

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Sonometer

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Megaphone

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Solution

The correct option is A Microphone
$(A)$ Microphone is used to measured absorption coefficient.
$(B)$ Volume resonator is used to measured speed of fle sound.
$(C)$ Sonometer is used to measured frequency of fle sound.
$(D)$ Megaphone is used to amplify the intensity of the sound.

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