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Math assignment Student’s Name Course Title Instructor’s Name The most destructive earthquake is Japan’s history (Links to an external site.)Links to an external site. took place near Honshu in 2011. It was a magnitude 9 earthquake. Some of the aftershocks were magnitude 7. How many =K/d^2 Where dB is decibel D is distance and K constant K = (dB) (d^2) 125(0.5^2) = 85 (d^2) 31.25= 85 (d^2) 0.36765=d^2 d =0.606 So you should sit 0.61 metres from the ignition site to reduce the sound level to safe values of 85 dB. [...]
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1. The most destructive earthquake is Japan’s history (Links to an external site.)Links to an external site. took place near Honshu in 2011. It was a magnitude 9 earthquake. Some of the aftershocks were magnitude 7. How many times more energy was released by the magnitude 9 earthquake than by the magnitude 7 aftershocks? 2. How many times louder is a jackhammer than a washing machine if a jackhammer produces a 120 dB sound and a washing machine produces an 80 db sound? 3. According to an article on Fireworks and Hearing Loss (Links to an external site.)Links to an external site., “Any noise above 85 dB is considered unsafe. Most firecrackers produce sounds starting at 125 dB.” Some Category 2 fireworks (sometimes called “garden fireworks”) produce a sound intensity of 125 dB 0.5 meters away from the ignition site. Based on this information, what is the minimum distance friends and family should stand away from the ignition site to be at a safe hearing distance?
Subject Area: Mathematics
Document Type: Dissertation Proposal
