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

a) Since the intensity is inversely related to the square of the distance, it follows that if the distance is doubled, the intensity is 1/4 as much. b) We use the equation for the decibel level: $\beta = 10log{(1/4)}\\ \beta = -6$ Thus, the decibel level is decreased by 6 decibels.