## Essential University Physics: Volume 1 (4th Edition)

a) $I =10^{-5.5}$ b) $I = 10^{-12.5}$
We use the equation for intensities to find: a) $65 = 10log(\frac{I}{10^{-12}}) \\ I =10^{-5.5}$ b) $-5 = 10log(\frac{I}{10^{-12}}) \\ I = 10^{-12.5}$