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  1. UV is a common abbreviation of ultraviolet, mainly used in technical contexts . Ultraviolet is beyond the visible violet light in terms of frequency, wavelength, and energy. Its wavelengths are between about 10 nanometers (nm) to about 400 nanometers. Frequency and wavelength are closely related. The equation that shows this relationship is: ν ...

  2. Different molecules will absorb different wavelengths of light. The wavelengths of light for UV-visible absorption are from about 200 nanometers to 800 nanometers. This is a section of the electromagnetic spectrum pictured. Absorption of light starts with energy

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    • United States
    • United Kingdom

    UHF frequencies have higher attenuation from atmospheric moisture and benefit less from 'bounce', or the reflection of signals off the ionosphere back to earth, when compared to VHF frequencies. The frequencies of 300–3000 MHz are always at least an order of magnitude above the MUF (Maximum Usable Frequency). The MUF for most of the earth is genera...

    On December 29, 1949 KC2XAK of Bridgeport, Connecticut became the first UHF television station to operate on a regular daily schedule. In the United States, UHF stations (broadcast channels above 13) originally gained a reputation for being more locally owned, less polished, less professional, less popular, and for having a weaker signal than their...

    In Britain, UHF television began with the launch of BBC2 in 1964, using a 625-line system (which had higher resolution, and therefore required greater bandwidth, than the existing 405-line system). BBC1 and ITV soon added their own 625-line services on UHF (British channels 21 to 69), and PAL colour was introduced on UHF only in 1967– 1969. VHF was...

  3. WP:SIMPLE. The Simple English Wikipedia is a free encyclopedia for people who are learning English. The Simple English Wikipedia's articles can be used to help with school homework or just for the fun of learning about new ideas. Non-English Wikipedias can also translate from the articles here. Wikipedia started on January 15, 2001 and it has ...

  4. An extended family from South Africa showing different skin colors. Human skin color is one of the most easily seen features of a person. It ranges in variety from the darkest brown to the lightest pinkish-white. Skin color is inherited and is the result of natural selection.

  5. simple.wikipedia.org › wiki › Main_PageWikipedia

    Lawrence is a city in Douglas County in the state of Kansas in the United States. It is in the northeastern part of the state, near the Kansas City area. It is the county seat of Douglas County. In 2010, 87,643 people lived there; though in 2019, there were an estimated 98,193 people. This makes it the sixth-biggest city in Kansas.

  6. Darkness. Darkness is when there is absence of light. In practice, out in the open air, there is always almost some light, however slight. The darkness of the night sky is estimated by a nine-point scale known as the Bortle scale . Darkness is made by blocking light from the sun or some other source of light, which makes shadow.

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