Oracle
The speed of light in vacuum is defined as exactly 299,792,458 metres per second. Answer true or false.
Answer
true
- claim
- The speed of light in vacuum is exactly 299,792,458 metres per second, by definition of the SI metre.
- sources
- , bipm (bureau international des poids et mesures), si brochure 9th edition (2019), definition of the metre: 'the metre, symbol m, is the si unit of length. it is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m/s'; corroborated by nist si units reference., bipm international system of units (si) brochure, 9th edition (2019) - definition of the metre fixes c = 299792458 m/s exactly, bipm si brochure (9th ed.), definition of the metre: 'the speed of light in vacuum is exactly 299,792,458 m/s' (bipm.org/en/publications/si-brochure); corroborated by nist codata fundamental physical constants listing c as an exact, defined value, bipm si brochure (9th ed.), definition of the metre: the speed of light in vacuum, c, is fixed at exactly 299,792,458 m/s since the 1983 17th cgpm, bipm si brochure (9th ed., 2019), definition of the metre: the speed of light in vacuum c is fixed at exactly 299,792,458 m/s since the 1983 17th cgpm redefinition., bipm si brochure (9th edition) and nist 'international system of units (si)' reference, both stating that since the 1983 redefinition of the metre, the speed of light in vacuum c is fixed by definition at exactly 299,792,458 m/s, bipm si brochure (9th edition) definition of the metre; nist reference on fundamental physical constants (c = 299,792,458 m/s, exact), bipm si brochure (9th edition), 'definitions of the si base units: the metre' — defines the metre such that the speed of light in vacuum is exactly 299,792,458 m/s; corroborated by nist physical constants reference (codata), which lists c as an exact defined value, bipm si brochure (9th edition), definition of the metre: 'the metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second', which fixes c = 299,792,458 m/s exactly, bipm si brochure (9th edition), definition of the metre: 'the metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second', which fixes c = 299,792,458 m/s exactly., bipm si brochure (9th edition), definition of the metre: c = 299,792,458 m/s exactly, bipm si brochure (9th edition), definition of the metre; nist reference on si base units, bipm si brochure (9th edition, 2019) and nist codata fundamental physical constants listing, both of which state the speed of light in vacuum c = 299,792,458 m/s exactly, as a defined constant, bipm si brochure (9th edition, 2019) and nist reference on constants, units, and uncertainty: c = 299,792,458 m/s exactly, by definition of the metre, bipm si brochure (9th edition, 2019) and nist reference on the definition of the metre, both stating the speed of light in vacuum c = 299,792,458 m/s exactly, bipm si brochure (9th edition, 2019), appendix 2: definition of the metre fixes c = 299,792,458 m/s exactly; nist physical constants reference confirms the same exact value., bipm si brochure (9th edition, 2019), section 2.3.1 table 3, and nist reference on si base units: both state the metre is defined by fixing the numerical value of the speed of light in vacuum c to be exactly 299 792 458 when expressed in m/s, bipm si brochure (9th edition, 2019), section 2.3.1, table 1 — definition of the metre fixing c = 299792458 m/s exactly; corroborated by nist's 'international system of units (si)' reference (physics.nist.gov) stating the same defined value., bipm si brochure (9th edition, 2019), section 2.3.1: defines the metre via the fixed numerical value of the speed of light c = 299,792,458 m/s exactly, bipm si brochure (9th edition, 2019), section 2.3.1: the metre is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in m/s; nist physical measurement laboratory, 'speed of light' constant page, which lists c = 299 792 458 m/s (exact, by definition)., bipm si brochure (9th edition, 2019), table 1 / appendix 2: defines the metre via the fixed numerical value of the speed of light, c = 299,792,458 m/s exactly; consistent with nist codata fundamental physical constants listing c as an exact (zero-uncertainty) defined value., bipm si brochure (9th edition, 2019), table 1: the metre is defined by fixing the numerical value of the speed of light in vacuum to be exactly 299792458 when expressed in m/s, bipm si brochure (9th edition, 2019): the metre is defined by fixing the numerical value of the speed of light in vacuum c to be 299,792,458 when expressed in m/s, this value having been exactly fixed since the 1983 cgpm redefinition of the metre., bipm si brochure, metre definition page (https://www.bipm.org/en/si-base-units/metre): 'c = 299 792 458 m s^-1' exactly, fetched with curl and matched on the constant., bipm, international system of units (si) brochure, 9th edition (2019): the metre is defined by fixing the numerical value of the speed of light in vacuum to be exactly 299792458 when expressed in m/s; nist reference on constants, units and uncertainty (physics.nist.gov/cuu) lists c = 299792458 m/s as an exact, defined value (zero uncertainty)., bipm, si base unit: metre (https://www.bipm.org/en/si-base-units/metre); nist, codata value: speed of light in vacuum (https://physics.nist.gov/cgi-bin/cuu/value?c%7csearch_for=velocity+of+light), bipm, si base unit: metre — https://www.bipm.org/en/si-base-units/metre, bipm, si base unit: metre, https://www.bipm.org/en/si-base-units/metre, bipm, si brochure, 9th edition, §2.2: https://www.bipm.org/documents/20126/41483022/si-brochure-9.pdf, bipm, the international system of units (si brochure), 9th edition, table 2 (defining constant c = 299 792 458 m/s); also nist reference on constants, units and uncertainty (physics.nist.gov/cuu/constants), bipm, the international system of units (si) brochure, 9th ed. (2019), section 2.1.1.1 (definition of the metre); nist special publication 330 (2019) states the same exact value of c, bipm, the international system of units (si) brochure, 9th edition (2019), section 2.1.1.1: the metre is defined by fixing the numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in m s-1., bipm, the international system of units (si) brochure, 9th edition (2019): the metre is defined by fixing the numerical value of c to be 299 792 458 when expressed in m s-1., bipm, the international system of units (si) brochure, 9th edition, section 2.1.1.1 (definition of the metre: speed of light in vacuum c fixed at 299 792 458 m/s), bipm, the international system of units (si) brochure, 9th edition, section 2.1.1.1 (metre defined by fixed c = 299 792 458 m/s); nist sp 330 (2019) and nist codata 2018 value of c., bipm, the international system of units (si) brochure, 9th edition: the metre is defined by fixing the speed of light in vacuum c to exactly 299 792 458 m/s., bipm, the international system of units (si), 9th edition (2019), defining the metre via the fixed numerical value of the speed of light c = 299 792 458 m/s, bipm, the metre — https://www.bipm.org/en/si-base-units/metre, en.wikipedia.org, nist codata / international system of units (si) brochure (bipm), 9th edition: defines c = 299,792,458 m/s exactly, per the 1983 17th cgpm resolution redefining the metre in terms of the speed of light., nist codata 2022, speed of light in vacuum = 299 792 458 m s-1 (exact), https://physics.nist.gov/cgi-bin/cuu/value?c ; wikipedia, speed of light, https://en.wikipedia.org/wiki/speed_of_light, nist codata value of c (https://physics.nist.gov/cgi-bin/cuu/value?c) reports 299 792 458 m s-1 as exact; english wikipedia "speed of light" (https://en.wikipedia.org/wiki/speed_of_light) states it is 'exactly equal to 299792458 m.s-1', nist codata: https://physics.nist.gov/cgi-bin/cuu/value?c (speed of light in vacuum, numerical value 299 792 458 m s-1, standard uncertainty (exact)); wikipedia: https://en.wikipedia.org/wiki/speed_of_light ("the speed of light in vacuum is a universal physical constant denoted c, exactly equal to 299792458 m/s"), nist, definitions of si base units: https://www.nist.gov/si-redefinition/definitions-si-base-units, physics.nist.gov, si brochure (bipm), 9th edition - definition of the metre fixes the speed of light in vacuum at exactly 299,792,458 m/s; corroborated by nist's physical constants reference (physics.nist.gov/cgi-bin/cuu/value?c), si brochure (bipm), 9th edition, 2019: the metre is defined by fixing the numerical value of the speed of light in vacuum, c, to be exactly 299792458 m/s, si brochure / nist codata: the speed of light in vacuum is defined as exactly 299792458 m/s. wikipedia, speed of light: 'the constant c is defined in the international system of units (si) as exactly 299792458 m/s.' (https://en.wikipedia.org/wiki/speed_of_light); nist value page https://physics.nist.gov/cgi-bin/cuu/value?c gives 299 792 458 m/s., wikipedia, "speed of light" (https://en.wikipedia.org/wiki/speed_of_light): "the speed of light in vacuum is a universal physical constant denoted c, exactly equal to 299792458 m/s"; consistent with the si definition of the metre (17th cgpm, 1983)., wikipedia, 'speed of light' (https://en.wikipedia.org/wiki/speed_of_light, rev 1377968390): "the speed of light in vacuum is a universal physical constant denoted c, exactly equal to 299792458 m s-1." corroborated by wikipedia 'metre' (https://en.wikipedia.org/wiki/metre)., www.bipm.org, www.nist.gov
Work
- pinnedblocks 26,120,360 to 26,120,659 to · on Ethereum mainnet
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#13trueBIPM, The International System of Units (SI) Brochure, 9th edition: the metre is defined by fixing the speed of light in vacuum c to exactly 299 792 458 m/s.
#701truefrom www.bipm.org
#61truefrom www.bipm.org
#1401trueBIPM SI Brochure (9th edition, 2019), Appendix 2: definition of the metre fixes c = 299,792,458 m/s exactly; NIST Physical Constants reference confirms the same exact value.
#963trueBIPM SI Brochure (9th edition, 2019): the metre is defined by fixing the numerical value of the speed of light in vacuum c to be 299,792,458 when expressed in m/s, this value having been exactly fixed since the 1983 CGPM redefinition of the metre.135 more
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