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  1. en.wikipedia.org › wiki › SunscreenSunscreen - Wikipedia

    Sunscreen, also known as sunblock[a] or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer. Sunscreens come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion[4]), sticks, powders and other topical products. Sunscreens are common supplements to ...

  2. en.wikipedia.org › wiki › UltravioletUltraviolet - Wikipedia

    Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...

  3. 其他人也問了

  4. Specific ultraviolet absorbance (SUVA) is the absorbance of ultraviolet light in a water sample at a specified wavelength that is normalized for dissolved organic carbon (DOC) concentration. Specific UV absorbance (SUVA) wavelengths have analytical uses to measure the aromatic character of dissolved organic matter by detecting ...

    • History and Discovery
    • Range
    • Regions
    • Types of Radiation
    • External Links

    Humans have always been aware of visible light and radiant heat but for most of history it was not known that these phenomena were connected or were representatives of a more extensive principle. The ancient Greeks recognized that light traveled in straight lines and studied some of its properties, including reflection and refraction. Light was int...

    Electromagnetic waves are typically described by any of the following three physical properties: the frequency f, wavelength λ, or photon energy E. Frequencies observed in astronomy range from 2.4×1023 Hz (1 GeV gamma rays) down to the local plasma frequency of the ionized interstellar medium (~1 kHz). Wavelength is inversely proportional to the wa...

    The types of electromagnetic radiation are broadly classified into the following classes (regions, bands or types): 1. Gamma radiation 2. X-ray radiation 3. Ultraviolet radiation 4. Visible light (light that humans can see) 5. Infrared radiation 6. Microwave radiation 7. Radio waves This classification goes in the increasing order of wavelength, wh...

    Radio waves

    Radio waves are emitted and received by antennas, which consist of conductors such as metal rod resonators. In artificial generation of radio waves, an electronic device called a transmitter generates an alternating electric current which is applied to an antenna. The oscillating electrons in the antenna generate oscillating electric and magnetic fields that radiate away from the antenna as radio waves. In reception of radio waves, the oscillating electric and magnetic fields of a radio wave...

    Microwaves

    Microwaves are radio waves of short wavelength, from about 10 centimeters to one millimeter, in the SHF and EHF frequency bands. Microwave energy is produced with klystron and magnetron tubes, and with solid state devices such as Gunn and IMPATT diodes. Although they are emitted and absorbed by short antennas, they are also absorbed by polar molecules, coupling to vibrational and rotational modes, resulting in bulk heating. Unlike higher frequency waves such as infrared and visible light whic...

    Infrared radiation

    The infraredpart of the electromagnetic spectrum covers the range from roughly 300 GHz to 400 THz (1 mm – 750 nm). It can be divided into three parts: 1. Far-infrared, from 300 GHz to 30 THz (1 mm – 10 μm). The lower part of this range may also be called microwaves or terahertz waves. This radiation is typically absorbed by so-called rotational modes in gas-phase molecules, by molecular motions in liquids, and by phonons in solids. The water in Earth's atmosphere absorbs so strongly in this r...

    Canadian Table of Frequency Allocations Archived 2008-12-09 at the Wayback Machine (from Industry Canada)
    U.S. Frequency Allocation Chart – Covering the range 3 kHz to 300 GHz (from Department of Commerce)
    UK frequency allocation table (from Ofcom, which inherited the Radiocommunications Agency's duties, pdf format)
  5. J. Robert Oppenheimer (born Julius Robert Oppenheimer; / ˈɒpənhaɪmər / OP-ən-hy-mər; April 22, 1904 – February 18, 1967) was an American theoretical physicist. He was director of the Manhattan Project 's Los Alamos Laboratory during World War II and is often called the "father of the atomic bomb ". Born in New York City, Oppenheimer ...

  6. en.wikipedia.org › wiki › SunSun - Wikipedia

    Sun. The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, [18] [19] heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.

  7. en.wikipedia.org › wiki › UnfrostedUnfrosted - Wikipedia

    Unfrosted is a 2024 American comedy film directed by Jerry Seinfeld (in his feature directorial debut) from a screenplay he co-wrote with his writing team of Spike Feresten, Barry Marder, and Andy Robin.It stars an ensemble cast that includes Seinfeld, Melissa McCarthy, Jim Gaffigan, Max Greenfield, Hugh Grant, and Amy Schumer. ...