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Sound Study Guide SOL 5.
Sound is a form of energy produced and transmitted by vibrating matter.
What is sound?
Sound travels in waves and can be described by the wavelength and frequency of the waves. A wave is a disturbance moving through a medium such as a solid, liquid, or gas.
What is a sound wave?
The distance between the top (crest) of one wave and another is the wave length (T)
crest crest
trough trough
What is a wavelength? What would a wavelength look like if we could see it?
The frequency of sound is the number of vibrations in a given unit of time.
What is frequency?
Pitch is determined by the frequency of a vibrating object. Objects vibrating faster have a higher pitch than objects vibrating slower.
What do high and low notes or sounds look like?
Loudness and softness of sound is determined by the height or amplitude of the sound wave.
Soft - short Loud - tall
Taller waves (higher amplitude) show louder sounds and shorter waves (lower amplitude) show softer sounds.
What do the wavelengths look like for loud or soft sounds?
Sound is a compression wave moving outward from its source. The wavelength of sound is the distance between two compressions. Rarefaction is the part of the wave where the molecules are spread father apart.
What is compression in a sound wave?
Musical instruments vibrate to produce sound. String instruments have strings that vibrate when something like your finger or bow moves across them.
Woodwinds and instruments with a reed, like a clarinet or oboe, use moving air to create a vibration of the reed to produce sound.
Percussion instruments are shaken, tapped, or banged to produce sound.
Brass instruments use the vibration of your lips to produce sound.
How do instruments produce sound?
