Polymers, whether natural or artificial, are big molecules made by linking up smaller repeating chemical units. The most common âbackbonesâ for polymers are chains of carbon or silicon, each of which can bond to four other atoms. Polymers, whether natural or artificial, are big molecules made by linking up smaller repeating chemical units.
Details About Pitch. Although for most practical purposes, the pitch of a sound can be said to be simply a measure of its frequency, there are circumstances in which a constant frequency sound can be perceived to be changing in pitch.
This is a background page to the multimedia chapters Sound and Quantifying Sound. 1  Definition and examples. 2  Sound files to show the size of a decibel. 3  Standard reference levels (absolute sound level)  Logarithmic 1  measures. The filters used for dB(A) and dB( C) Loudness, phons and sones, hearing response curves.