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Marise's Sound Notes
Terms in this set (34)
What is matter?
Solid , Liquid or Gas
What is Sound?
A wave that is produced by a vibrating object that travels through matter.
What are vibrations?
Rapid back and forth movements.
What are material mediums?
Solids, Liquids and gases [Ex. wood, water and air.
What produces sound waves?
Rapid back and forth movements- Vibrations
Which direction do sound waves travel?
What is a compression?
When things are bunched together [ex.
What is one wavelength?
The distance from one compression to the next.
How does sound travel?
In all directions from a vibrating object.
How does distance affect sound?
The closer you are to an object, the louder the object will sound. As sound waves move farther away from the object, they lose energy and become weaker.
What is a vacuum?
Empty space void of air.
In order of fastest to slowest, how quickly does sound travel through the different mediums?
A. solids [fastest] steel pipe. B.Liquids [water] C. Gas [air]
Why would sound travel faster through liquids then gases?
*particles/ molecules are packed together
Who would hear a sound faster, a diver underwater or a runner?
What are 2 factors that determine the speed of a sound?
Type of medium [matter] and temperature.
Does sound travel faster in hot or cold temperatures?
Hot temperatures because the molecules may be spread out more, but they move more quickly. Cold air molecules are closer together, but move very slowly.
What is a sonic boom?
When something that travels faster than the speed of sound, the sound waves bunch up and a loud sound is created when the object smacks into the sound waves.
What are supersonic speeds?
a speed faster than sound.
What is amplitude? [Volume]
The amount of energy a sound wave has. Amplitude describes the height of the sound wave. Amplitude is measured in decibels (db)
What is volume?
The loudness or softness of a sound. Also known as the intensity of a sound.
What is the pitch of sound?
The highness of lowness of a sound. (Wavelength) measured in hertz (Hz)
What does the pitch of a sound rely on?
What is frequency?
*The number of vibrations in 1 second.
*The number of waves that pass through a certain point in a second.
*The number of waves per cycle.
How do you alter pitch?
Length, tightness, and thickness
Longer~ Lower pitch and shorter is higher pitch
Looser~ Lower pitch and tighter is higher pitch thicker is lower pitch and thinner is higher pitch.
Draw a sound wave with a low frequency/ low pitch.
Wave is spread apart/ long wavelength.
What instrument has a frequency with long wavelengths?
Tuba [low pitch]
Draw a sound wave with a high frequency and high pitch.
wave is compressed/ short wavelength
What instrument has a high frequency waves and short wavelengths?
A. Draw a high pitched soft sound.
( wave is frequent or compressed for high pitch and short amplitude/height for soft volume)
B. Draw a low pitched soft sound.
Low pitch~ Wave is spread out (not compressed)
Soft sound~ short amplitude/height
C. Draw a high pitched loud sound.
High pitch~ Wave is compressed
Loud volume~b Wave amplitude/ height is tall
What does it mean for a sound can be absorbed?
Sound is taken in so that the sound is softer.
What is an echo?
Sound waves hit hard surfaces and reflect or bounce back. When the waves reflect back you can hear the sound.
What materials help sound to reflect?
Hard, flat, non porous surfaces reflect sound walls.
What materials help absorb sound?
Soft, rough, porous surfaces absorb sound Curtains, Furniture, blankets, shrubbery (trees and bushes with leaves.
What is sonar?
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