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39) Republic Day 2020 Parade FEATURES: Colourful tableaux, daredevilry, government might on display

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Natural infrared

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Sunlight, at an effective temperature of 5,780 kelvins (5,510 °C, 9,940 °F), is composed of near-thermal-spectrum radiation that is slightly more than half infrared. At zenith, sunlight provides an irradiance of just over 1 kilowatt per square meter at sea level. Of this energy, 527 watts is infrared radiation, 445 watts is visible light, and 32 watts is ultraviolet radiation. Nearly all the infrared radiation in sunlight is near infrared, shorter than 4 micrometers. On the surface of Earth, at far lower temperatures than the surface of the Sun, some thermal radiation consists of infrared in the mid-infrared region, much longer than in sunlight. However, black-body, or thermal, radiation is continuous: it gives off radiation at all wavelengths. Of these natural thermal radiation processes, only lightning and natural fires are hot enough to produce much visible energy, and fires produce far more infrared than visible-light energy.
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Definition and relationship to the electromagnetic spectrum

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Infrared radiation extends from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 millimeter (mm). This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz. Below infrared is the microwave portion of the electromagnetic spectrum. Light comparison Name Wavelength Frequency (Hz) Photon energy (eV) Gamma ray less than 0.01 nm more than 30 EHz more than 124 keV X-ray 0.01 nm – 10 nm 30 EHz – 30 PHz 124 keV – 124 eV Ultraviolet 10 nm – 400 nm 30 PHz – 790 THz 124 eV – 3.3 eV Visible 400 nm – 700 nm 790 THz – 430 THz 3.3 eV – 1.7 eV Infrared 700 nm – 1 mm 430 THz – 300 GHz 1.7 eV – 1.24 meV Microwave 1 mm – 1 meter 300 GHz – 300 MHz 1.24 meV – 1.24 μeV Radio 1 mm – 10,000 km 300 MHz – 30 Hz 1.24 μeV – 124 feV
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