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
Mathematics
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