Which of the following is the line of reflection? 1) y=2x
2) x=2
3) y=2
4) x=-2
5) y=-2

Richter defined the magnitude of an earthquake to be m = log i/s , where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. the magnitude of a standard earthquake is m = log s/s =