A248922 - OEIS

A248922

Number of wavelengths of the orange-red line of a krypton isotope with mass number 86 in a vacuum.

1, 6, 5, 0, 7, 6, 3, 7, 3

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

7,2

COMMENTS

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

LINKS

Table of n, a(n) for n=7..15.

Wikipedia, Krypton

Wikipedia, History of the metre

Wikipedia, Metre

Wikipedia, Speed of light

EXAMPLE

1650763.73...

CROSSREFS

Cf. A003678.

Sequence in context: A340443 A096434 A193355 * A316253 A352527 A261992

Adjacent sequences: A248919 A248920 A248921 * A248923 A248924 A248925

KEYWORD

nonn,cons

AUTHOR

Arkadiusz Wesolowski, Oct 16 2014

STATUS

approved