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Viola sororia ( / vaɪˈoʊlə səˈrɔːriə / vy-OH-lə sə-ROR-ee-ə ), [ 5] known commonly as the common blue violet, is a short-stemmed herbaceous perennial plant native to eastern North America. It is known by a number of common names, including common meadow violet, purple violet, woolly blue violet, hooded violet, and wood violet.
Ace ring, meant to be worn on the right middle finger. The ace ring, a black ring worn on the middle finger of one's right hand, is a way asexual people signify their asexuality. The ring is deliberately worn in a similar manner as one would a wedding ring to symbolize marriage.
Pride flags can represent various sexual orientations, romantic orientations, gender identities, subcultures, and regional purposes, as well as the LGBT community as a whole. There are also some pride flags that are not exclusively related to LGBT matters, such as the flag for leather subculture. The rainbow flag, which represents the entire ...
Main article: Light-emitting diode physics. In a light-emitting diode, the recombination of electrons and electron holes in a semiconductor produces light (be it infrared, visible or UV), a process called " electroluminescence ". The wavelength of the light depends on the energy band gap of the semiconductors used.
Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).
Incandescence is the emission of electromagnetic radiation (including visible light) from a hot body as a result of its high temperature. [ 1] The term derives from the Latin verb incandescere, to glow white. [ 2] Although an object does not have to glow brightly or glow white in order to be considered incandescent.
Camassia quamash is a perennial plant with a herbaceous character that has a wide a wide range of variation across its geographical range. [7] It is a monocot that has grasslike leaves, as typical of that group, that emerge from a persistent bulb. [8] [9] The bulb is of moderate size, 1 to 5 centimeters ( to 2 in) in diameter.