Can be classified into three groups, according to their frequency ranges. Infra sound consists of frequencies below 20hz.
It is precieved by means of...
Ear
It depends on the frequency of its vibration.
In music it is related to notes ( A-B-C-D-)
Main topic
Travels through matter
It is commonly associated in air, sound will readily travel through many materials. It will absorb much of the sound waves preventing the waves from penetrating the material.
It is different depending on its....
Qualities long or short depending on its length of vibrations.
