An earthquake in the Japan in 2011 was about 109 times as intense as the reference intensity. Find the Richter number for that earthquake.
 
NOTE: Seismologists use the Richter scale to measure and report the magnitude of earthquakes. The equation compares the intensity I of an earthquake to a minimum or reference intensity I0.
 

A. 109
B. 10
C. 9
D. none of these


Answer: C

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