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A248922
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Number of wavelengths of the orange-red line of a krypton isotope with mass number 86 in a vacuum.
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1
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OFFSET
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7,2
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COMMENTS
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In 1960, the meter was redefined in terms of a number of wavelengths of the orange-red spectral line in the electromagnetic radiation emanating from an excited atom of krypton-86.
Since 1983, it has been defined as the distance light travels in a vacuum in 1/299,792,458 seconds. - Jon Perry, Oct 18 2014
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LINKS
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EXAMPLE
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1650763.73...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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