On the Richter Scale, the Magnitude R of an Earthquake

question 25

Multiple Choice

On the Richter scale, the magnitude R of an earthquake is given by the formula where I is the intensity of the earthquake being measured and I₀ is the standard reference intensity. ​
Express the intensity I of an earthquake of magnitude in terms of the standard intensity I₀.
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Express the intensity I of an earthquake of magnitude in terms of the standard intensity I₀.
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How many times greater is the intensity of an earthquake of magnitude 8 than one of magnitude 6?
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In modern times the greatest loss of life attributable to an earthquake occurred in eastern China in 1976. Known as the Tangshan earthquake, it registered 8.2 on the Richter scale. How does the intensity of this earthquake compare with the intensity of an earthquake of magnitude ? Round your answer to the nearest integer.
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• A) ; ; 100; 153
• B) ; ; 2; 143
• C) ; ; 100; 168
• D) ; ; 100; 158

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