Common logarithms are used to measure the intensity of earthquakes. If R is the intensity of an earthquake on the Richter scale, A is the amplitude (measured in micrometers) of the ground motion and P is the period (the time of one oscillation of the Earth's surface measured in seconds), then R = log A/P  If an earthquake has amplitude of A = 8,000 micrometers and a period of P = 0.5 second, what is its measure on the Richter scale? Round to the nearest tenth

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