Ultraviolet (UV) radiation is similar to visible light in all physical aspects, except that it does not enable us to see things. The light that enables us to see things is referred to as visible light and is composed of the colors we see in a rainbow.
Playing Regulations. A game of basketball is made up of four quarters, each ten (or in the National Basketball Association 12,) minutes long. At the start of every game the referee throws the basketball up in the air, and one player from each team tries to hit it to their teammates, that is called a jump ball..
1.1.1 Length of game is 4 quarters of 20 minutes playing time. When play is unduly delayed, such as the ball going out of the playing area, time is added on to the playing time of the quarter. This is referred to as 'time on'.