# Waves, Sound and Light: Sound and Music

## Sound and Music: Audio Guided Solutions

#### Problem 8:

Determine the decibel rating of the following sound sources and their estimated sound intensities.
a. Science office at 5 PM on a weeknight: I = ~1 x 10-9 W/m2
b. South's student library after school: I = ~1 x 10-6 W/m2
c. Period 7 at the beginning of class: I = ~1 x 10-4 W/m2
d. Titan Dome on a Friday night during basketball season: I = 8.1 x 10-3 W/m2
e. Fall Out Boy concert - front row: I = 7.4 x 10-2 W/m2

## Audio Guided Solution

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## Habits of an Effective Problem Solver

• Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
• Identify the known and unknown quantities and record in an organized manner, often times they can be recorded on the diagram itself. Equate given values to the symbols used to represent the corresponding quantity (e.g., v = 345 m/s, λ = 1.28 m, f = ???).
• Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
• Identify the appropriate formula(s) to use.
• Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.