2. Loudness (L), in decibels (dB), of a sound of intensity / is defined to be L = 10 log -, where lo = 10712 - (Watts per meter square) is the minimum intensity detectable by the human ear. (2 points) a) Find the loudness L , in decibels (dB), of a trombone given the intensity is 10 1, (Round your answer to the nearest decibel.) (2 points) b) Find the intensity of a rock concert whose loudness is 115 decibels. (Express your answer in Watts per square meter rounded to four decimal places, as necessary.) (2 points) c) What is the NIOSH Recommended Exposure Limit (REL) given in dB based on exposures at work 5 days per week? (1 point)