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clear
//
//
//
//Variable declaration
I0=10^-12; //standard intensity level(watt/m^2)
A=1.4; //area(m^2)
il=60; //intensity level(decibels)
//Calculations
x=10^(il/10);
I=x*10^-12; //intensity level(watt/m^2)
Ap=I*A; //acoustic power(watt)
//Result
printf("\n acoustic power is %e watt",Ap)
printf("\n answer in the book is wrong")
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