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Page 1: Sound waves ccp

Sound Waves

October 20, 2014

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Objectives

1. Understand that a sound wave is a compressional wave

2. Label compression, rarefaction, wavelength,

3. Recognize how sound moves and the related terms, loudness, pitch, frequency, and acoustics

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Waves transfer energy not matter.

Waves can only exist as they have energy to carry.

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• Compressional Waves

matter in the wave moves back and forth

parallel to the direction of the wave

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Sound Waves

Compressional wave

travels as vibrations moving through the air

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Compressional Longitudinal wave

the area squeezed together - compression.

area spread out –rarefaction.

The wavelength - one compression next

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What is sound?

Sound - compressional wave which travels through the air through a series of compressions and rarefactions.

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Sound travels through different media.

We hear sound which usually travels through air.

travels through other media and at different speeds

travels faster in a solid than a liquid and a gas.

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The denser the medium, the faster sound will travel.

The higher the temperature, the faster the sound travels.

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How is frequency related to pitch?

The pitch of a sound wave is directly related to frequency.

A high-pitched sound has a high frequency (a screaming girl).

A low-pitched sound has a low frequency (a fog-horn).

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Using Sound

What is Acoustics?

Acoustics is the study of sound and ways to optimize the hearing of sound inside various structures.


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