Use the formula below where L is loudness measured in decibels, I is intensity of sound, and I0 is the lowest-intensity sound that the average human ear can detect. L=10logII0 . Suppose the sound intensity of a fan must be reduced by one third. By how many decibels would the loudness be decreased? Hint: Let I1 = present intensity, I2 = reduced intensity, L1 = present loudness, and L2 = reduced loudness. A. about 1.76 dB B. about 2.24 dB C. about 0.25 dB D. about 1.35 dB