Lesson # 16: Richter Scale, pH Scale & Decibels

Earth Quake: Richter Scale




4.0 ------x10------ 5.0 ------x10 ------ 6.0 ------x10 ------ 7.0


R = 10    P = 1

pH Scale:

Sounds- decibels dbs:

40 dbs  > whisper      90 dbs > shout

           |  100000 times louder   |

R= 10      P= 10


Example 1:
How much more intense is an Earthquake of 6.8 to a 3.5?
F = IR ^ t/p                     M= magnitude   M=F       I= 1            t= change   
M= 10^ 3.3/1
M= 1995.26

Example 2:
A chainsaw of 105dbs to a whisper of 40dbs
M = R^t/p
M= 10^ 65/10                     
M= 10^ 6.5
M= 3162277.66

Example 3:
Find the pH that is 80x more basic than water?
water= pH 7
M = R ^t/p
80= 10 ^t
log 80 = t log10                    *note log10 = 1*
1.90= t
7+ 1.9= 8.9
t= 8.9