P = 4π watt
TI = 100 dB
R ?
TI = 10 log (I ÷ Io)
100 = 10 log (I ÷ 10^-12)
100 ÷ 10 = log (I ÷ 10^-12)
10 = log (I ÷ 10^-12)
I ÷ 10^-12 = 10^10
I = 10^10 × 10^-12
I = 10^-2 = 0,01 W/m^2
I = P ÷ (4 π × R × R)
0,01 = 4π ÷ (4π × R × R)
0,01 = 1 ÷ (R × R)
0,01 × R × R = 1
R × R = 1 ÷ 0,01 = 100
R = akar 100 = 10 m
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P = 4π watt
TI = 100 dB
R ?
TI = 10 log (I ÷ Io)
100 = 10 log (I ÷ 10^-12)
100 ÷ 10 = log (I ÷ 10^-12)
10 = log (I ÷ 10^-12)
I ÷ 10^-12 = 10^10
I = 10^10 × 10^-12
I = 10^-2 = 0,01 W/m^2
I = P ÷ (4 π × R × R)
0,01 = 4π ÷ (4π × R × R)
0,01 = 1 ÷ (R × R)
0,01 × R × R = 1
R × R = 1 ÷ 0,01 = 100
R = akar 100 = 10 m