On the Richter scale, which measures the total amount of energy released during an earthquake, a reading of x-1 indicates one-tenth the released energy as is indicated by a reading of x. On that scale, the frequency corresponding to a reading of 7 is how many times as great as the frequency corresponding to a reading of 2?
Pick.
A) 40 B) 50 C) 10^4 D) 10^5 E) 10^6
If Richter scale reading goes from X-1 to X it will be 10   if Richter scale reading goes from 2 to 3 it will be 10   if Richter scale reading goes from 3 to 4 it will be 10   if Richter scale reading goes from 4 to 5 it will be 10   if Richter scale reading goes from 5 to 6 it will be 10   Similarly if Richter scale reading goes from 6 to 7 it will be 10   so it will from 2 to 7 i.e 3,4,5,6,7 = 10*10*10*10*10 = 10^5   Answer is 10^5
<result>D</result>
On the Richter scale, which measures the total amount of energy released during an earthquake, a reading of x-1 indicates one-tenth the released energy as is indicated by a reading of x. On that scale, the frequency corresponding to a reading of 7 is how many times as great as the frequency corresponding to a reading of 2?