The formula L=10 log| gives the loudness of sound L (in dB) based on the intensity of sound I (in W/m). The value I = 10 W/m is the minimal - 12 threshold for hearing for midfrequency sounds. Hearing impairment is often measured according to the minimal sound level (in dB) detected by an individua sounds at various frequencies. For one frequency, the table depicts the level of hearing impairment. Category Mild Moderate Moderately severe Severe Profound Loudness (dB) 26L40 41L55 56L70 71 L90 L>90 (a) If the minimum intensity heard by an individual is 8487.6 108 W/m, determine if the individual has a hearing impairment. -8 Round to the nearest tenth. (b) If the minimum loudness of sound detected by an individual is 90 dB, determine the corresponding intensity of sound.