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eardrum
the thin membrane in the ear that vibrates when sound waves hit it
vacuum
The absence of matter (molecules, atoms or any particles) in a volume of space
frequency
The total number of waves passing per second (measured in Hertz)
amplitude
Is half the total height of the wave, that tells you how much energy the sound has or how LOUD it is
Pitch
Is how high or how low the note is. High pitch is the same as high frequency.
echo
sound being reflected from a surface
Audible range
The frequencies of sound an animal or human can hear
Ultrasound
A very high frequency sound that cannot be heard by humans
sound wave
A wave that transmits sound by particles vibrating in either a solid, liquid or gas.
Compression
The squashing together of particles
Rarefaction
The spreading apart of particles
Sonar
A system that uses ultrasound to detect underwater objects or to determine the depth of the water
Decibels (dB)
The unit of measurement of sound intensity or loudness
hertz
the unit of frequency
Ear defenders
Used to protect ears from noise