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8L Sound @ AJHS

8L sound and hearing

QuestionAnswer
amplitude Half the height of a wave.
cochlea The part of the ear that changes vibrations into electrical impulses.
decibel (dB) Unit for measuring the loudness of a sound.
eardrum A thin membrane inside the ear which vibrates when sound reaches it.
frequency The number of waves each second.
hertz (Hz) The unit for frequency. 1 hertz means one wave per second.
impulse Electrical signal carried by a nerve cell.
intensity The loudness or volume of a sound.
loudness How loud a sound is; the volume of a sound.
noise Unpleasant sound.
oscilloscope An instrument which shows a picture of a wave on a screen.
pitch How high or low a note sounds.
sound intensity meter A meter which measures the loudness of a sound.
threshold of hearing The quietest sound that can be heard.
vacuum A completely empty space with no particles.
vibrate Move backwards and forwards.
wave A way of transferring energy. Waves can be side to side or backwards and forwards movements.
wavelength The distance between the top of one wave and the top of the next.
Created by: johncl