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Decibel gain Find the dB gain of an amplifier when
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College Algebra (MindTap Course List)
- Self check Find the dB gain if the input is 0.7 volt. Round to the nearest decibel.arrow_forwardSound Intensity The relationship between the number of decibels and the intensity of a sound I (in watts per square meter) is =10logI1012 Find the intensity I for each decibel level . (a) =60 (b) =135 (c) =1arrow_forwardEarthquake Intensity The magnitude of an earthquake, measured on the Richter scale, is given by RI=logII0, where I is the amplitude registered on a seismograph located 100 Km from the epicenter of the earthquake, and I0 is the amplitude of a certain small size earthquake. Find the Richter scale ratings of earthquakes with the following amplitudes. a. 1,000,000I0 b. 100,000,000I0 c. On June 15,1999, the city of Puebla in central Mexico was shaken by an earthquake that measured 6.7 on the Richter scale. Express this reading in terms of I0. Source: Exploring Colonial Mexico. d. On September 19,1985, Mexicos largest recent earthquake, measuring 8.1 on the Richter scale, killed about 10,000 people. Express the magnitude of an 8.1 reading in terms of I0.Source: History.com. e. Compare your answers to part c and d. How much greater was the force of the 1985 earthquake than the 1999 earthquake? f. The relationship between the energy E of an earthquake and the magnitude on the Richter scale is given by RE=23logEE0, where E0 is the energy of a certain small earthquakes. Compare the energies of the 1999 and 1985 earthquakes. g. According to newspaper article, "Scientists say such an earthquake of magnitude 7.5 could release 15 times as much energy as the magnitude 6.7 trembler that struck the Northbridge section of Los Angeles" in 1994.Source: The New York Times. Using the formula from part f, verify this quote by computing the magnitude of an earthquake with 15times the energy of a magnitude 6.7 earthquake.arrow_forward
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