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The Spectronic 20 is a brand of single-beam spectrophotometer, designed to operate in the visible spectrum [1] across a wavelength range of 340 nm to 950 nm, with a spectral bandpass of 20 nm. [ 2 ] [ 3 ] It is designed for quantitative absorption measurement at single wavelengths. [ 1 ]
The red curve in the graph shows that photons around 610 nm (orange-red) have the highest amount of photosynthesis per photon. However, because short-wavelength photons carry more energy per photon, the maximum amount of photosynthesis per incident unit of energy is at a longer wavelength, around 650 nm (deep red).
Each letter designates a section of light of the electromagnetic spectrum; these cover well the consecutive major groups, near-ultraviolet (NUV), visible light (centered on the V band), near-infrared (NIR) and part of mid-infrared (MIR). [a] The letters are not standards, but are recognized by common agreement among astronomers and astrophysicists.
The effective wavelength (spectral) range of a spectrometer is determined not only by the grating dispersion ability but also depends on the detectors' sensitivity range. Limited by the semiconductor's band gap the silicon-based detector responds to 200-1100 nm while the InGaAs based detector is sensitive to 900-1700 nm (or out to 2500 nm with ...
The wavelength range from approximately 200 μm up to a few mm is often referred to as Submillimetre astronomy, reserving far infrared for wavelengths below 200 μm. Mid-infrared , from 30 THz to 120 THz (10–2.5 μm).
25 meters – wavelength of the broadcast radio shortwave band at 12 MHz; 29 meters – height of the Savudrija Lighthouse; 30 meters – height of Christ the Redeemer; 31 meters – wavelength of the broadcast radio shortwave band at 9.7 MHz; 32 meters – length of one arcsecond of latitude on the surface of the Earth
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