Solve
-Use the Formula $R = \log \left( \frac { a } { T } \right) + B$

Multiple Choice

Solve.
-Use the formula $R = \log \left( \frac { a } { T } \right) + B$ to find the intensity $R$ on the Richter scale, given that amplitude $a$ is 426 micrometers, time T between waves is $3.3$ seconds, and B is 2.1. Round answer to one decimal place.

A) $2.1$
B) $7.2$
C) $4.2$
D) 7