Dados: log10 0,5 = – 0,3; Gt(dB) = 44 dB; At(dB) = 99 dB; Gr(dB) = 48 dB; P1 = 700 W. P2(dB) = Gt(dB) – At(dB) + Gr(dB) = 44 – 99 + 48 = – 7 dB P...

Dados: log10 0,5 = – 0,3; Gt(dB) = 44 dB; At(dB) = 99 dB; Gr(dB) = 48 dB; P1 = 700 W.

P2(dB) = Gt(dB) – At(dB) + Gr(dB) = 44 – 99 + 48 = – 7 dB

P2(dB) = 10log10 ( P2 / P1 )

– 7 = 10log10 ( P2 / 700 )

– 7 / 10 = log10 ( P2 / 700 )

– 0,7 = log10 ( P2 / 700 )

– (1 – 0,3) = log10 ( P2 / 700 )

– (log10 10 + log10 0,5) = log10 ( P2 / 700 )

– log10 (10  0,5) = log10 ( P2 / 700 )

– log10 5 = log10 ( P2 / 700 )

log10 5– 1 = log10 ( P2 / 700 )

log10 ( 1 / 5 ) = log10 ( P2 / 700 )

1 / 5 = P2 / 700

5  P2 = 1  700

P2 = 700 / 5

P2 = 140 W

Resp.: Alternativa A.


a) 140 W.
b) 280 W.
c) 420 W.
d) 560 W.
e) 700 W.