On the Richter Scale, the Magnitude of an Earthquake

Multiple Choice

On the Richter scale, the magnitude of an earthquake is given by the formula where is the intensity of the earthquake being measured and is the standard reference intensity. Express the intensity of an earthquake of magnitude in terms of the standard intensity .
Express the intensity of an earthquake of magnitude in terms of the standard intensity .
How many times greater is the intensity of an earthquake of magnitude 7 than one of magnitude 5?
In modern times the greatest loss of life attributable to an earthquake occurred in eastern China in 1976. Known as the Tangshan earthquake, it registered 8.2 on the Richter scale. How does the intensity of this earthquake compare with the intensity of an earthquake of magnitude ? Round your answer to the nearest integer.

A) ;
; 2; 1,570
B) ;
; 100; 1,595
C) ;
; 100; 1,585
D) ;
; 100; 1,580