This type of cable is commonly supplied in ready made DIY telephone extension kits; the type that are plugged in rather than require hard wiring. The reason this cable is so common is that it is very cheap and it is easy to install the connectors on the end.his cable is used for and works well for voice and ADSL as its twisted pair construction provides some resistance to interference. As the CW1308 cable is essentially the same spec cable is used throughout the whole telephone network, it known to work well.
How are visible light waves made? Visible light waves are made when a photon is emitted from a source and has a frequency, or the correct am mount of energy, to create visible light at a specific color.
Visible light is the portion of the electromagnetic spectrum that is visible to the human eye, ranging from roughly 390 to 750 nm. Learning Objective. Key Points. Visible light is produced by vibrations and rotations of atoms and molecules, as well as by electronic transitions within atoms and molecules. We say the atoms and molecules are excited when they absorb and relax when they emit through electronic transitions.