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//chapter 14
//example 14.5
//page 302
P1=1.5 // W
P2=0.3 // W
Pi=10d-3 // W
// power gain at 2 kHz
Ap1=10*log10(P1/Pi)
// power gain at 20 Hz
Ap2=10*log10(P2/Pi)
Ap_diff=Ap1-Ap2
printf("fall in gain from 2 kHz to 20 Hz = %.3f db \n",Ap_diff)
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