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Waves
Different types of waves and sounds
Question | Answer |
---|---|
wave | rythmic disturbance that carries energy through matter or space |
medium | a material through which a wave transfers energy |
wavelength | the distance between a point on one wave and the identical point on the next wave |
amplitude | the distance from the crest point to the rest point in a wave |
frequency | the number of compressions that pass through a given point in a second |
frequency is measured in this unit | hertz |
transverse waves | waves that move at right angles to the medium |
compressional wave | when the matter vibrates in the same direction as the medium |
compressional wave consits of two main areas | compression and rarefaction |
four components of a wave | wavelengths, frequencies, amplitudes, velocities |
frequencies above 20,000 hertz | ultrasonic |
frequencies below 20 hertz | infrasonic |
loudness | the human perception of sound intensity |
noise | no set pattern or definite pitch |
resonance | when sound reaches an object at the same frequency as the object's natural frequency, the object will the begin to vibrate |
quality | describes the differences among sounds of the same pitch and loudness |
interference | ability of two or more waves to combine and form a new wave |
constuctive interference | compressions of different waves which arrive at the same place at the same time |
destructive interference | compressions of one wave which arrives with a rarefaction of another wave |
reverbation | the effect produced by many reflections of sound |
acoustics | the study of sound |
natural frequency | when waves reflect back and forth between ends |
crest | highest point of a wave |
trough | lowest point of a wave |