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7th grade science
Define and identify sound waves, energy, etc.
Question | Answer |
---|---|
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. |