| Question |
 |
|
| Answer |
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| acoustics |
The effect of materials and their shapes on sound. |
| amplitude |
The distance that a wave rises or falls from its normal rest position. |
| beats |
The destructive interference of two sound wave with slightly different frequencies and similar amplitudes. |
| compressions |
A region where air molecules are pushed closer together than normal by the energy of a wound wave. |
| decibels (db) |
The smallest difference in intensity between two sounds that the human ear is capable of detecting. |
| Doppler effect |
The effect of motion on sound; named in honor of the Austrian physicist Christian Doppler. |
| Echolocation |
Animals use this to find prey by sending out a high-pitched frequency which bounces off the prey. |
| 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. |
| loudness |
Related to intensity; how strong or weak a sound is to an observer. |
| pitch |
The distance between two adjacent threads on a screw; how high or low a tone sounds to an observer (related to frequency). |
| rarefactions |
A region where the air molecules are spread apart by the energy of a sound wave. |
| resonance |
The transfer of energy from one object to another object with the same natural frequency. |
| sonar |
A type of listening device that uses sound waves to locate object; sound navigation and ranging. |
| sound |
Mechanical waves that can often be detected by our ears. |
| threshold of hearing |
The very softest sound level that can be detected by an observer. |
| ultrasonic waves |
Sound waves that are too high in frequency for the human ear to hear. |
| waves |
Rhythmic disturbances that transfer energy through space or matter. |
Science Vocab 147928
