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10 questions from this quiz
W⋅m−2\text{W} \cdot \text{m}^{-2}W⋅m−2
Inversely proportional to distance squared
It becomes one-quarter
It becomes one-ninth
10−12 W⋅m−210^{-12} \text{ W} \cdot \text{m}^{-2}10−12 W⋅m−2
Logarithmic
Tenfold increase
A point source with no reflections
I=10(dB10−12)I = 10^{\left(\frac{\text{dB}}{10} - 12\right)}I=10(10dB−12)
I2=I116I_2 = \frac{I_1}{16}I2=16I1
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