Find the Magnitude R of an Earthquake of Intensity $\left. I \text { (let } I _ { 0 } = 1 \right)$

Multiple Choice

Find the magnitude R of an earthquake of intensity $\left. I \text { (let } I _ { 0 } = 1 \right)$ . $I = 270300000$

A) 7.43
B) 6.43
C) 8.43
D) 10.43
E) 9.43