The magnitude of an earthquake, R is defined by R log10 where I, is the intensity of the earthquake (measured by the amplitude of a seismograph reading taken 100 km from the epicenter of the earthquake) and In is the intensity of a "standard earthquake" (whose amplitude is 1 micron = 10-4 cm). The 1906 San Francisco earthquake had a magnitude of 8.3 on the Richter scale. At the same time in South America there was an eathquake with magnitude 5.2 that caused only minor damage. How many times more intense was the San Francisco earthquake than the South American one? Round your answer to two decimal places. The San Francisco earthquake was times more intense than the South American Earthquake.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter6: Exponential And Logarithmic Functions
Section: Chapter Questions
Problem 50RE: The formula for measuring sound intensity indecibels D is defined by the equation D=10log (II0),...
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The magnitude of an earthquake, R is defined by R = log10
where I, is the intensity of the
In
earthquake (measured by the amplitude of a seismograph reading taken 100 km from the epicenter
of the earthquake) and In is the intensity of a "standard earthquake" (whose amplitude is 1 micron
= 10¬ cm).
4
The 1906 San Francisco earthquake had a magnitude of 8.3 on the Richter scale. At the same time in
South America there was an eathquake with magnitude 5.2 that caused only minor damage. How
many times more intense was the San Francisco earthquake than the South American one? Round
your answer to two decimal places.
The San Francisco earthquake was
times more intense than the South American
Earthquake.
Transcribed Image Text:The magnitude of an earthquake, R is defined by R = log10 where I, is the intensity of the In earthquake (measured by the amplitude of a seismograph reading taken 100 km from the epicenter of the earthquake) and In is the intensity of a "standard earthquake" (whose amplitude is 1 micron = 10¬ cm). 4 The 1906 San Francisco earthquake had a magnitude of 8.3 on the Richter scale. At the same time in South America there was an eathquake with magnitude 5.2 that caused only minor damage. How many times more intense was the San Francisco earthquake than the South American one? Round your answer to two decimal places. The San Francisco earthquake was times more intense than the South American Earthquake.
Solve for x in terms of a and b.
log
log x =
5(log a + log b) + 4 log b°
+ 2(log b- log a)
Write your answer without using logs.
Transcribed Image Text:Solve for x in terms of a and b. log log x = 5(log a + log b) + 4 log b° + 2(log b- log a) Write your answer without using logs.
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