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Pacing himself with the WaveLight technology seen low on the inside rail, Uganda’s Joshua Cheptegei set a world record in the men's 5,000-meters in Monaco in August 2020—a mark he’d break two months later in Spain. Daniel Cole/Pool via Getty Images ByDominic Massimino
The effective velocity of light in various transparent substances containing ordinary matter, is less than in vacuum. For example, the speed of light in water is about 3/4 of that in vacuum. In about 300 BC, Euclid wrote Optica, in which he studied the properties of light. Euclid postulated that light travelled in straight lines and he described the laws of reflection and studied them mathematically. He questioned that sight is the result of a beam from the eye, for he asks how one sees the stars immediately, if one closes one's eyes, then opens them at night. If the beam from the eye travels infinitely fast this is not a problem. [32] The behavior of EMR depends on its wavelength. Higher frequencies have shorter wavelengths and lower frequencies have longer wavelengths. When EMR interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum it carries. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates and vampire squid use it to hide themselves from prey.Singh, S. (2009). Fundamentals of Optical Engineering. Discovery Publishing House. ISBN 978-8183564366.
Barrow, Gordon M. (1962). Introduction to Molecular Spectroscopy (Scanned PDF). McGraw-Hill. LCCN 62-12478.
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Ahluwalia, V.K.; Goyal, Madhuri (2000). A Textbook of Organic Chemistry. Narosa. p.110. ISBN 978-81-7319-159-6 . Retrieved 20 October 2013. Svitil, Kathy A. (5 February 2004). "Asteroids Get Spun By the Sun". Discover Magazine. Archived from the original on 9 October 2012 . Retrieved 8 May 2007. The wavelength is the distance between any two successive points on a wave that are in phase (e.g., two successive crests or two successive troughs).
Beyond competitions, Som says, WaveLight gives coaches a unique tool for instructing larger groups of runners. “The big advantage as a coach is you really can shift from having a stopwatch and seeing if the athletes are doing the right times and yelling ‘faster’ or ‘slower,’ to focusing more on technique because you can see how the athletes relate to certain times. Bradt, Hale (2004). Astronomy Methods: A Physical Approach to Astronomical Observations. Cambridge University Press. p.26. ISBN 978-0-521-53551-9 . Retrieved 20 October 2013.You always have people who have problems with innovation, and that’s really normal, that’s OK,” Som says. “But the main thing, the most important thing for us, is to keep the sport alive. We give fans something extra to go to a venue and to see competition in real life because you understand it.
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