(3 points) Sounds are produced when vibrating objects create pressure waves in some medium such as air. When these variations in pressure reach the human eardrum, it causes the eardrum to vibrate in a similar manner and the ear detects sound. The intensity of sound is measured as power per unit area. The threshold for hearing (minimum sound detectable by a young, healthy ear) is defined to be lo 10-12 W/m² (watts per square meter). The sound level L, or "loudness” of sound is measured in decibels (dB) as L = 10 log where I is the intensity of the (6) given sound. Use this formula for this problem. C (a) Find the sound level of a motorcycle if its intensity is 109 times Io. Answer: dB IP TE (b) Find the sound level of a vacuum cleaner if its intensity, is 10times I, Answer: dB (C) How many times more intense is the sound of a motorcycle than a vacuum cleaner.​