Physics, 28.06.2019 04:20 yuvin

Aperson when asked to speak up, increases her sound level from 30db to 60db. the amount of power per unit area increased by? a)3000 times b)30 times c)2 times d)1000 times

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Aperson when asked to speak up, increases her sound level from 30db to 60db. the amount of power per...