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Review of Sound Waves. Waves move and carry energy Waves travel in a medium Waves are created when a source of energy causes a medium to vibrate Waves spread out as they move Waves have different sizes and shapes Waves pass through each other

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Review of sound waves
Review of Sound Waves

  • Waves move and carry energy

  • Waves travel in a medium

  • Waves are created when a source of energy causes a medium to vibrate

  • Waves spread out as they move

  • Waves have different sizes and shapes

  • Waves pass through each other

  • Waves continue in the medium until they reach a barrier

  • Waves do not disappear at barriers (waves diffract around corners)


Sound
Sound

  • Sound is produced when objects vibrate

  • It is a compression wave (or longitudinal wave)

  • It needs something to travel through

  • It travels through matter


Sound waves
Sound Waves

Molecules in the air vibrate about some average position creating the compressions and rarefactions.


Longitudinal Wave

wave particles vibrate back

and forth along the path that

the wave travels.

Compressional Wave



Frequency – How many wavelengths pass a point in a unit of time (the shorter the wavelength, the higher the frequency.)

  • Sound

  • Hz (Hertz) – 1 wavelength/sec.

  • We hear it as pitch

  • High frequency – high pitch

  • Low frequency – low pitch

Image: scanned from Multimedia Concepts – James Schuman


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