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Overview The Facts of Sound The Ear and Sound Sound Vocabulary Musical Instruments and Sound
The Facts Sound … Is a form of energy produced & transmitted by vibrating matter Travels in waves Travels more quickly through solids than liquids or gases A wave is a repeating disturbance or movement that transfers energy through matter or space
The water waves below are carrying energy. Waves can only exist as they have energy to carry.
a wave travels through the springs just like sound waves travel through the air
the places where the springs are close together are like compressions in the air.
Alternating areas of high & low pressure in the air
ALL sound is carried through matter as sound waves
Sound waves move out in ALL directions from a vibrating object
Wavelength & Frequency
Wavelength is the distance between one part of a waveand the same part of the next wave
Frequency is the number of waves moving past a point in one second
Frequency is the number of waves (vibrations) that pass through a point in one second. Period is the time it takes for one full wavelength to pass a certain point. Frequency is waves per second. Period is seconds per wave.
Pitch A measure of how high or low a sound is Pitch depends on the frequency of a sound wave For example,