1. LEQ: How can logarithmic scales to solve real world situations? Logarithmic Scales Sec. 9-6

2. Logarithmic Scale Are useful when all numbers are positive and cover a range of values from small to very large. Two commonly used logarithmic scales Decibel scale pH scale

3. Decibel Scale Measures sound intensity Pg. 563 A formula which relates the sound intensity N in w/m 2 to its relative intensity D in decibels is For example: Find the relative intensity in decibels of a conversation in which the sound intensity is 3.16 x 10 -6 w/m 2.

4. pH Scale Measures the concentration of hydrogen ions in a substance Pg. 566 The acidity or alkalinity of a substance is measured on the pH scale pH can range from 0 to 14 Less than 7…acidic Equal 7…neutral Greater than 7…alkaline where H + is the concentration of hydrogen ions (in moles/liter) of the substance

5. Your Turn Lesson Master 9-6A #1, 3, 6, 10

6. Homework Pgs. 566-569 #1-19, 21, 23, 24, 26, 27