# Intensity and Loudness of Sound

## Explores how the amount of energy present in a sound changes how we perceive it.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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## Characteristics of Sound Waves - Overview

by CK-12 //basic
Overview
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## Characteristics of Sound Waves - Example 3

by CK-12 //basic
Identifying regions of compressions and rarefactions for sound waves
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## Characteristics of Sound Waves - Example 4

by CK-12 //basic
Measuring the intensity of a spherical sound wave using the equation I = P/ (4πr^(2))
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• Video

## Characteristics of Sound Waves - Example 5

by CK-12 //basic
Comparing the relative intensities of two sound waves based on factors of 10 for every 10 dB
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## Characteristics of Sound Waves - Example 6

by CK-12 //basic
Measuring the relative intensity of a sound wave using the equation β = 10log (I / I[0])
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• Video

## Characteristics of Sound Waves - Example 1

by CK-12 //basic
Recognizing that frequency determines pitch
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## Characteristics of Sound Waves - Example 2

by CK-12 //basic
Recognizing that amplitude determines loudness
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