In this unit you need to understand that sound is a type of wave and that be altering certain characteristics of the wave we alter how we perceive its pitch and volume.
Vibration - A back and forth motion that repeats.
Longitudinal wave - Where the direction of vibration is the same as that of the wave.
Volume - How loud or quiet a sound is, in decibels (dB).
Pitch - How low or high a sound is. A low (high) pitch sound has a low (high) frequency.
Amplitude - The maximum amount of vibration, measured from the middle position of the wave, in metres.
Wavelength - Distance between two corresponding points on a wave, in metres.
Frequency - The number of waves produced in one second, in hertz.
Vacuum - A space with no particles of matter in it.
Oscilloscope - Device able to view patterns of sound waves that have been turned into electrical signals.
Absorption - When energy is transferred from sound to a material.
Auditory range - The lowest and highest frequencies that a type of animal can hear.
Echo - Reflection of sound waves from a surface back to the listener.