The Richter scale model for measuring magnitude R of an earthquake is modeled by the equation R=log ( a/T )+B , where a is the amplitude in micrometers, T is the period in seconds, and B represents the dampening effect (weakening) of the wave due to the distance from the epicenter of the quake.
Find the magnitude r of a quake where a=230, t=2 and b=4.5
