According to our research of Texas and other state lists there were 170 registered sex offenders living in Katy, Texas as of April 20, 2017. The ratio of number of residents in Katy to the number of sex offenders is 86 to 1. Median real estate property taxes paid for housing units with mortgages in 2015: $3,678 (2.1%)
solar spectrum. The distribution of electromagnetic radiation emitted by the sun. Although the solar spectrum essentially covers the entire electromagnetic spectrum, most of the energy is concentrated in an interval whose wavelengths span from approximately 300 nm to 3000 nm.
This is because the frequencies of the visible spectrum are so large that it is more convenient to use wavelengths. The visible spectrum ranges from approximately 400 nanometers to 700 nanometers. A nanometer (nm) is 10^-9 meters, or one billionth of a meter, so visible light waves are extremely small. These wavelengths correspond to frequencies in the range of 750 terahertz to 429 terahertz.