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L is used here instead of B because it is the SI symbol for spectral radiance. The L in c 1 L refers to that. This reference is necessary because Planck's law can be reformulated to give spectral radiant exitance M ( λ , T ) rather than spectral radiance L ( λ , T ) , in which case c 1 replaces c 1 L , with
The International Phonetic Alphabet uses diacritic symbols and characters to indicate phonetic features or secondary articulations. Irish uses the acute to indicate that a vowel is long: á, é, í, ó, ú. It is known as síneadh fada "long sign" or simply fada "long" in Irish.
For b < 1, log b (x) tends to minus infinity instead. When x approaches zero, log b ...
ASCII (/ ˈ æ s k iː / ⓘ ASS-kee), [3]: 6 an acronym for American Standard Code for Information Interchange, is a character encoding standard for electronic communication. . ASCII codes represent text in computers, telecommunications equipment, and other devic
An equal sign is often used for the eyes in place of the colon, seen as =). It has become more acceptable to omit the hyphen, whether a colon or an equal sign is used for the eyes. [56] One linguistic study has indicated that the use of a nose in an emoticon may be related to the user's age, with younger people less likely to use a nose. [57]
Apollo 1, initially designated AS-204, was planned to be the first crewed mission of the Apollo program, [1] the American undertaking to land the first man on the Moon. It was planned to launch on February 21, 1967, as the first low Earth orbital test of the Apollo command and service module.
The greenhouse effect on Earth is defined as: "The infrared radiative effect of all infrared absorbing constituents in the atmosphere.Greenhouse gases (GHGs), clouds, and some aerosols absorb terrestrial radiation emitted by the Earth’s surface and elsewhere in the atmosphere."