Science Vocab Chapter 19

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Terms in this set (...)

Sound
Mechanical waves that can often be detected by our ears
Waves
Rhythmic disturbances that transfer energy through space or matter
Compressions
A region where air molecules are pushed closer together than normal by the energy of a sound wave
Rarefactions
A region where the air molecules are spread apart by the energy of a sound wave
Pitch
How high or low a tone sounds to our ears
Frequency
The number of waves that pass a given point in one second
Infrasonic waves
Sound waves that are too low in frequency for the human ear to hear
Ultrasonic waves
Sound waves that are too high in frequency for the human ear to hear
Loudness
Related to intensity; how strong or weak a sound is to an observer
Decibels
The smallest difference in intensity between two sounds that the human eat is capable of detecting
Threshold of hearing
The very softest sound level that can be detected by an observer
Amplitude
The distance that a wave rises or falls from its normal rest position
Acoustics
The effect of materials and their shapes on sound
Resonance
The transfer of energy from one object to another object with the same natural frequency
Beats
The destructive interference of two sound waves with slightly different frequencies and similar amplitudes
Doppler effect
The effect of motion on sound; named in honor of the Austrian physicist Christian Doppler
Sonar
A type of listening device that uses sound waves to locate objects; sound navigation and ranging
Echolocation
Emitting a high-pitched frequency to reflect off an object and use the reflected waves to create an image of the object