When a sound with a particular frequency is played at a loudness of 60 dB, and compared to the same sound played at 10 dB, what can be said about the intensity (in W/m2 ) of the 60 dB sound? It is:

D: If a sound is 10 times more intense (10 × more W/m2 ) than another sound of the same frequency, then it is 10 decibel (1 bel) louder. If it is 100 times more intense, it sounds 20 decibel louder. Hence, remembering the logarithmic nature of the loudness scale, a sound that is 50 dB (5 bel) louder than another, is also 100,000 times (105 ) more intense.