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  2. Radiant energy - Wikipedia

    en.wikipedia.org/wiki/Radiant_energy

    In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic [1] and gravitational radiation. As energy, its SI unit is the joule (J). The quantity of radiant energy may be calculated by integrating radiant flux (or power ) with respect to time .

  3. Radiant energy density - Wikipedia

    en.wikipedia.org/wiki/Radiant_energy_density

    In radiometry, radiant energy density is the radiant energy per unit volume. [1] The SI unit of radiant energy density is the joule per cubic metre (J/m 3).

  4. Electromagnetic radiation - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_radiation

    The energy of an individual photon is quantized and proportional to frequency according to Planck's equation E = hf, where E is the energy per photon, f is the frequency of the photon, and h is the Planck constant. Thus, higher frequency photons have more energy.

  5. Template:SI radiometry units - Wikipedia

    en.wikipedia.org/wiki/Template:SI_radiometry_units

    Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power", and called luminosity in Astronomy. Spectral flux: Φ e,ν [nb 3] watt per hertz: W/Hz: M⋅L 2 ⋅T −2: Radiant flux per unit frequency or wavelength. The latter is commonly measured in W⋅nm −1. Φ e,λ [nb 4] watt ...

  6. Solar energy - Wikipedia

    en.wikipedia.org/wiki/Solar_energy

    Solar energy is the radiant energy from the Sun's light and heat, which can be harnessed using a range of technologies such as solar electricity, solar thermal energy (including solar water heating) and solar architecture.

  7. Low emissivity - Wikipedia

    en.wikipedia.org/wiki/Low_emissivity

    Low emissivity (low e or low thermal emissivity) refers to a surface condition that emits low levels of radiant thermal (heat) energy. All materials absorb, reflect, and emit radiant energy according to Planck's law but here, the primary concern is a special wavelength interval of radiant energy, namely thermal radiation of materials. In common ...

  8. Infrared heater - Wikipedia

    en.wikipedia.org/wiki/Infrared_heater

    The majority of the radiant energy released at operational temperatures is transmitted through the thin quartz tube but some of that energy is absorbed by the silica quartz glass tube causing the temperature of the tube wall to increase, this causes the silicon-oxygen bond to radiate far infrared rays.

  9. Reflectance - Wikipedia

    en.wikipedia.org/wiki/Reflectance

    Φ e,ν r is the spectral radiant flux in frequency reflected by that surface; Φ e,ν i is the spectral radiant flux in frequency received by that surface; Φ e,λ r is the spectral radiant flux in wavelength reflected by that surface; Φ e,λ i is the spectral radiant flux in wavelength received by that surface.