The power output of an audio system is 18 W. For a person to notice a – McqOptions

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1.	The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
A.	2 W
B.	6 W
C.	68 W
D.	None of the above
Answer» D. None of the above

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