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7th grade science

Define and identify sound waves, energy, etc.

Pitch Perception of the frequency of a sound.
Acoustics Study of how well sounds can be heard
Sonogram Image formed by an ultrasound machine.
Intensity Amount of energy per second carried through a unit area by a wave.
Noise Mixture of sound waves with no pleasing timbre
Infrasound frequencies below 20 hz.
Ultrasound frequencies above 20,000 hz.
Beats Regular changes in loudness of a sound when two sounds of different frequencies are played together.
Loudness Perception of the intensity of sound.
Decibels Unit of measurement of loudness.
Timbre quality of sound.
Sonar System of detecting reflected sound waves.
Dissonance Sound produces when notes that have no musical relationship are played together.
Density Ratio of the mass of substance to its volume.
Larynx Two folds of tissue that make up the human voice box.
Doppler effect apparent change in frequency of a sound as the source moves in relation to the listener.
Echolocation use of reflection of sound waves to navigate and to locate prey.
Music Set of tones and overtones combined in ways that are pleasing to the ear.
Elasticity Ability of a material to bounce back after being disturbed.
Resonance Increase in the amplitude of vibration that occurs when external vibrations match the objects natural frequency.