Sound waves
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Sound Waves. What is Sound?. Sound is caused by a vibration of atoms in pulses. Each sound wave pulses with a certain frequency. The vibration pulse causes areas of compressions and rarefactions in the atoms of the medium. http:// www.youtube.com/watch?v=J2BUvWRCBGM

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Sound Waves

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Sound waves

Sound Waves


What is sound

What is Sound?

  • Sound is caused by a vibration of atoms in pulses. Each sound wave pulses with a certain frequency. The vibration pulse causes areas of compressions and rarefactions in the atoms of the medium.

  • http://www.youtube.com/watch?v=J2BUvWRCBGM

  • Sound is a longitudinal /compressional wave, which is a type of mechanical wave.

  • Sound waves can be caused by transverse waves such as those produced when you pluck or strum a guitar string. The energy in the transverse wave is transferred into a longitudinal wave; each crest creates an area of compression in the air around the string.

  • http://www.youtube.com/watch?v=TKF6nFzpHBU


Anatomy of a sound wave

Anatomy of a Sound Wave


Properties and observations

Properties and Observations

  • Speed

  • Wavelength

  • Frequency

  • Amplitude

  • Pitch

  • Loudess


Speed of sound

Speed of Sound

  • Sound waves travel the best in solids and worst in air.

  • The closer together the atoms are, the faster the sound will travel.

  • Sound will not travel in a vacuum, such as space because there is no matter/medium for the wave to vibrate.


Pitch

Pitch

  • Pitch is determined by frequency.

  • The higher the frequency the higher the pitch.

  • Each pitch as a set frequency therefore to change pitch one must change wavelength or speed.


Loudness

Loudness

  • Loudness is a result of amplitude of the sound wave.

  • The more energy you put into the sound wave the higher the amplitude and the louder the sound.

  • The high the amplitude the louder the sound. This is why amplifiers make sound louder.


Relationships between w ave p roperties

Relationships Between Wave Properties


Wavelength and frequency

Wavelength and Frequency

  • Since speed is controlled by the medium the wave is travelling through:

  • When the speed is constant (no change in medium) in order for pitch to change the frequency must change, in order to change frequency the wavelength must change.

    • As wavelength increases frequency decreases, which causes pitch to decrease.

    • As wavelength decreases frequency increases, which causes pitch to increase.


Medium and frequency

Medium and Frequency

  • When the medium in which the wave is travelling changes the speed changes.

  • When the speed changes the wavelength and frequency change inversely and create a different pitch.


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