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An increase of one unit of Richter Scale represents an increase in amplitude by a factor of

  • A.10
  • B.100
  • C.1000
  • D.2

Answer: A

The Richter scale is logarithmic to the base 10: an increase of one unit means that the amplitude of the seismic wave is ten times larger (and the energy about thirty-two times larger). So the factor is 10. The values 100 and 1000 are the factors for two and three units, and 2 is not a factor of the scale.

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