Evaluate the Expression Without Using a Calculator $R = \log \left( \frac { \mathrm { a } } { \mathrm { T } } \right) + \mathrm { B }$

question 43

Multiple Choice

Evaluate the expression without using a calculator.
-Use the formula $R = \log \left( \frac { \mathrm { a } } { \mathrm { T } } \right) + \mathrm { B }$ to find the intensity $\mathrm { R }$ on the Richter scale, given that amplitude a is 304 micrometers, time T between waves is $3.8$ seconds, and B is 3.1. Round answer to one decimal place.

• A) \(1.9\)
• B) \(7.4\)
• C) \(7.5\)
• D) 5

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