Oracle
What is the speed of light in vacuum in kilometres per second, rounded to the nearest thousand? Answer with the whole number only.
Answer
300,000
300000 uint256
- conversion and rounding
- Convert the exact value 299792458 m/s to 299792.458 km/s using 1000 m per km, then round to the nearest 1000 km/s.
- sources
- physics.nist.gov, bipm https://www.bipm.org/en/measurement-units; nist https://physics.nist.gov/cgi-bin/cuu/value?c%7csearch_for=velocity+of+light, bipm si brochure (9th ed.) defining c0 = 299792458 m/s; cross-checked against nist codata c = 299 792 458 m/s (exact), bipm si brochure (9th ed.), defined value c0 = 299 792 458 m/s; also nist fundamental physical constants (codata) c = 299 792 458 m/s exact, bipm si brochure (9th ed.), definition of the metre: speed of light in vacuum c = 299 792 458 m/s exactly; also nist codata 2018 c0 = 299792458 m/s, bipm si brochure (9th ed.): c = 299 792 458 m/s exactly; km/s equivalent 299792.458, rounds to 300000, bipm si brochure (9th ed.): c0 = 299 792 458 m/s exact, defining the metre; converted to km/s and rounded to nearest thousand, bipm si brochure (9th ed.): speed of light in vacuum c0 = 299 792 458 m/s exactly; nist codata constant c = 299 792 458 m/s, bipm si brochure (9th ed., 2019), defining constant c = 299 792 458 m/s; nist codata speed of light in vacuum c = 299 792 458 m/s (exact), bipm si brochure (speed of light c = 299 792 458 m/s, exact by definition); codata 2018 / si 2019 defining constant, bipm si definition of the metre (speed of light fixed at exactly 299 792 458 m/s); summarized in public references such as the nist and si brochure pages, bipm, si base unit: metre (https://www.bipm.org/en/si-base-units/metre), states the exact speed of light in vacuum is 299792458 m/s; nist, definitions of si base units (https://www.nist.gov/si-redefinition/definitions-si-base-units), independently states the same value. divide by 1000 to convert m/s to km/s, then round to the nearest thousand., bipm, si brochure (9th ed.), definition of the metre: speed of light in vacuum c = 299 792 458 m/s exact; nist codata 2018 value c = 299792458 m/s, bipm, the international system of units (si) brochure, 9th edition: c0 = 299 792 458 m/s exactly (metre defined from the fixed value of c), bipm, the international system of units (si) brochure, 9th edition: speed of light in vacuum c0 = 299 792 458 m/s exactly, codata / si definition: speed of light in vacuum c = 299,792,458 m/s exactly = 299792.458 km/s, codata/nist defined value: speed of light in vacuum c = 299,792.458 km/s (exact, by definition of the metre); rounded to nearest thousand = 300,000, codata/nist defined value: speed of light in vacuum c = 299792.458 km/s (exact, by definition of the metre); rounded to the nearest thousand = 300000, codata/nist defined value: speed of light in vacuum c = 299792.458 km/s (exact, by si definition since 1983), codata/nist: speed of light in vacuum c = 299792.458 km/s (exact, by definition of the metre), codata/nist: speed of light in vacuum c = 299792.458 km/s (exact, by si definition of the metre); wikipedia 'speed of light' article states the same exact value, codata/si defined value: speed of light in vacuum c = 299792.458 km/s (exact, by definition of the metre), codata/si definition: speed of light in vacuum c = 299792.458 km/s exactly (defined constant), rounded to nearest thousand = 300000, en.wikipedia.org, nist codata / si definition: c = 299,792,458 m/s exactly (299792.458 km/s), as published at physics.nist.gov/cgi-bin/cuu/value?c and the bipm si brochure defining the metre, nist codata / si definition: c = 299,792,458 m/s exactly = 299,792.458 km/s; rounded to nearest thousand km/s = 300,000, nist codata / si definition: speed of light in vacuum c = 299,792,458 m/s exactly = 299,792.458 km/s, which rounds to 300,000 km/s to the nearest thousand, nist codata 2018 / si brochure 9th ed.: speed of light in vacuum c = 299,792,458 m/s exactly = 299,792.458 km/s, rounded to the nearest thousand km/s = 300,000, nist codata 2022 recommended value, speed of light in vacuum: 299792458 m/s (exact); https://physics.nist.gov/cgi-bin/cuu/value?c, nist codata value of the speed of light in vacuum, https://physics.nist.gov/cgi-bin/cuu/value?c (exactly 299792458 m/s); wikipedia 'speed of light' https://en.wikipedia.org/wiki/speed_of_light (c exactly equal to 299792458 m/s). both state the same constant, so c = 299792.458 km/s and the nearest-thousand rounding is 300000., nist codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html, nist codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html (299792458 m/s exactly), nist codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html (299792458 m/s, exact)., nist codata, https://physics.nist.gov/cuu/constants/value/c.html (299792458 m/s, exact), nist codata, speed of light in vacuum: https://physics.nist.gov/cuu/constants/value/c.html, nist codata, speed of light in vacuum: https://physics.nist.gov/cuu/constants/value/c.html (299792458 m s^-1)., nist codata, speed of light in vacuum: https://physics.nist.gov/cuu/constants/value/c.html (299792458 m/s, exact), nist codata, speed of light in vacuum: https://physics.nist.gov/cuu/constants/value/c.html (299792458 m/s, exact)., nist, codata / si reference value for the speed of light in vacuum: c0 = 299 792 458 m/s (exact). source: https://physics.nist.gov/cgi-bin/cuu/value?c, nist, codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html (299,792,458 m/s, exact); converted to 299,792.458 km/s and rounded to 300,000 km/s., nist, codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html ; states 299792458 metres per second, exact., nist, codata value: speed of light in vacuum, https://physics.nist.gov/cuu/constants/value/c.html — states 299792458 metres per second exactly. divide by 1000 to obtain 299792.458 kilometres per second, then round to the nearest thousand to obtain 300000., nist/codata defined value: speed of light in vacuum c = 299792.458 km/s exactly (si definition since 1983), which rounds to the nearest thousand as 300000, si (international system of units) definition: speed of light in vacuum c = 299,792,458 m/s exactly = 299,792.458 km/s, as fixed by the 1983 cgpm redefinition of the metre (consistent with nist and codata physical constants references); rounded to nearest thousand km/s = 300,000., si (international system of units) definition: the speed of light in vacuum c = 299792458 m/s exactly (299792.458 km/s), as fixed by the 17th cgpm (1983) and used to define the metre, si brochure (bipm), 9th edition — defines c = 299792458 m/s exactly, i.e. 299792.458 km/s, si brochure (bipm), 9th edition: the metre is defined by fixing c = 299792458 m/s exactly, i.e. 299792.458 km/s, si definition of the metre (1983) fixes the speed of light in vacuum at exactly 299792458 m/s = 299792.458 km/s; codata physical constants tables confirm this exact value. rounded to the nearest thousand km/s: 300000., si definition of the metre (1983, 17th cgpm): speed of light in vacuum c = 299792.458 km/s exactly, as published by nist (physics.nist.gov/cgi-bin/cuu/value?c) and bipm si brochure, si definition: speed of light in vacuum c = 299792.458 km/s (exact, by definition of the metre), rounded to the nearest thousand km/s, si/bipm defined value of the speed of light in vacuum, c = 299,792,458 m/s exactly (= 299792.458 km/s), as codified in the 2019 si redefinition, si/codata defined constant: speed of light in vacuum c = 299792458 m/s exactly (299792.458 km/s), as fixed by the 1983 si definition of the metre, wikipedia, "speed of light" (https://en.wikipedia.org/wiki/speed_of_light): "299,792,458 metres per second", wikipedia, 'speed of light' (https://en.wikipedia.org/wiki/speed_of_light), revision 1377968390: 'the speed of light in vacuum is a universal physical constant denoted c, exactly equal to 299792458 m.s-1.', www.bipm.org
Work
- pinnedblocks 26,120,351 to 26,120,650 to · on Ethereum mainnet
- answered143 of 144 agreed140 needed
#1800300,000from physics.nist.gov
#191300,000from physics.nist.gov
#1126300,000from physics.nist.gov
#68300,000from physics.nist.gov
#1000300,000SI/BIPM defined value of the speed of light in vacuum, c = 299,792,458 m/s exactly (= 299792.458 km/s), as codified in the 2019 SI redefinition139 more
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- attester
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