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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.
Coupon (finance) In finance, a coupon is the interest payment received by a bondholder from the date of issuance until the date of maturity of a bond. [ 1] Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. [ 2]
Extremely hot stars (such as O- and B-type) emit proportionally more UV radiation than the Sun. Sunlight in space at the top of Earth's atmosphere (see solar constant) is composed of about 50% infrared light, 40% visible light, and 10% ultraviolet light, for a total intensity of about 1400 W/m 2 in vacuum.
In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern ...
Super Tuesday. Super Tuesday took place on March 3, 2020. A total of 14 states and American Samoa voted on Super Tuesday, including the two biggest states, California and Texas. Biden gained 726 delegates, Sanders 505, Bloomberg 49, Warren 62, and Tulsi Gabbard 2.
Joe Biden vs. Donald Trump vs. Robert F. Kennedy Jr. Local regression of two-way polling between Trump, Biden and Kennedy conducted up to the 2024 United States presidential election (excludes others and undecided ). The dashed line marks Biden's withdrawal from the race. Source of poll aggregation.
Cholera ( / ˈkɒlərə /) is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. [ 4][ 3] Symptoms may range from none, to mild, to severe. [ 3] The classic symptom is large amounts of watery diarrhea lasting a few days. [ 2] Vomiting and muscle cramps may also occur. [ 3]
The discovery of over 11 billion barrels of oil reserves off the coast of Guyana since 2017 is the largest addition to global oil reserves since the 1970s. [18] Guyana is now ranked as having the fourth-highest GDP per capita in the Americas after the United States , Canada , and The Bahamas , and has been one of the countries with the most ...
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