iPad 10:53 PM 77% earthquake that registered 5.7 on the Richter scale? 10 times
ID: 2910661 • Letter: I
Question
iPad 10:53 PM 77% earthquake that registered 5.7 on the Richter scale? 10 times larger (b) While the decibel scale can be used in many disciplines,t we shall restrict our attention to its use in acoustics, specifically its use in measuring the intensity level of sound.t The Sound Intensity Level L (measured in decibels) of a sound intensity I (measured in watts per square meter) is given by LC-100-12 () Like the Richter scale, this scale compares 1 to baseline: 10-12 is the threshold of human hearing. m2 (i) Compute L(10-8). (ii) Damage to your hearing can start with short term exposure to sound levels around 115 decibels. What intensity I is needed to produce this level? (Round your answer to three decimal places watts per square meter (ii) Compute L(1). How does this compare with the threshold of pain which is around 140 decibels? A sound with intensity level 140 decibels has an intensity intesity level 120 decibels. times greater than a sound with (c) The pH of a solution is a measure of its acidity or alkalinity. Specifically, pH-log[H'] where [H"] is the hydrogen ion concentration in moles per liter. A solution with a pH less than 7 is an acid, one with a pH greater than 7 is a base (alkaline) and a pH of 7 is regarded as neutral. (i) The hydrogen ion concentration of pure water is [H+] = 10-7. Find its pH. (ii) Find the pH of a solution with [H+]-9.3 x 10-13 (Round your answer to one decimal place.) (i) The pH of gastric acid (the acid in your stomach) is about 0.7, What is the corresponding hydrogen ion concentration? (Round your answer to four decimal places.) moles per liter Additional Materials Reading Submit Save Progress Home My Assignments Extension RequestExplanation / Answer
b.i. L(10-8)=10 log(10-8/10-12) = 10 log(104) =10*4=40
ii.115 = 10 log(I/10-12)
11.5= log(1012I)
1011.5/1012=I
I=0.316
iii.L(1)=10log(1/10-12)
= 10log(1012)= 10*12=120
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