Unit 4.2 Flashcards
Decibel (dB)
Unit used to measure loudness
Compression
A region of high pressure where particles are close together
Echo
A sound that is reflected and heard a second time
Frequency
The number of waves passing a point every second
Hertz (Hz)
The unit used to measure frequency
Infrasound
The sounds produced by waves of very low frequency, less than 20 Hz
Longitudinal wave
A wave in which the vibration is in the same direction that the wave is travelling
Rarefaction
A region of low pressure, in which particles are far apart
Sound wave
Regions of high and low pressure originating from a vibrating object and transmitted through a medium
Tinnitus
Constant ringing in the ears caused by prolonged exposure to loud sounds
Transverse wave
A wave in which the vibration is at right angles to the direction the wave is travelling
Wave length
The distance from one peak of a wave to the next
Ultrasound
The sounds produced by waves of greater frequency than humans can hear (greater than 20,000 Hz)