Chapter 12, Section 2 Properties of Sound

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Presentation transcript:

Chapter 12, Section 2 Properties of Sound http://offsydeproductions.com/wordpress/wp-content/uploads/2008/07/sound-wave1.gif

Definitions Amplitude: the amount of energy a wave carries; related to the density of the particles in the compressions and rarefactions Intensity: the amount of energy that flows through a certain area in a specific amount of time Loudness: the human perception of sound intensity; measured using the decibel (dB)

Definitions Pitch: how low or high a sound seems to be; human perception of frequency Frequency: the number of compressions or rarefactions of a sound wave that pass per second; human ears can hear frequencies from about 20 to 20,000 Hz

Definitions Ultrasonic: sound waves with frequencies over 20,000 Hz that have medical and scientific uses Infrasonic (subsonic): sound waves with frequencies less than 20 Hz; can’t be heard but we feel the vibration as a rumble Doppler Effect: change in pitch of wave frequency due to a moving wave source; either the source of the wave or the observer can be moving

Sound links http://library.thinkquest.org/19537/Physics.html http://www.physicsclassroom.com/class/sound/ http://method-behind-the-music.com/mechanics/physics http://www.youtube.com/watch?v=HpovwbPGEoo