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A248508 Decimal expansion of K_J = 2 e/h (Josephson constant) in units of A s^2 kg^{-1} m^{-2} in the 2019 SI system of units. 2
4, 8, 3, 5, 9, 7, 8, 4, 8, 4, 1, 6, 9, 8, 3, 6, 3, 2, 4, 4, 7, 6, 5, 8, 2, 8, 5, 0, 5, 4, 5, 2, 8, 1, 3, 5, 3, 5, 3, 3, 5, 1, 1, 8, 6, 6, 0, 0, 4, 0, 1, 4, 4, 6, 0, 9, 6, 9, 7, 4, 9, 9, 2, 0, 3, 2, 0, 4, 1, 7, 9, 7, 8, 0, 6, 8, 0, 4, 0, 8, 2, 8, 0, 9, 1, 7, 4, 6, 0, 5, 5, 5, 4, 0, 9, 3, 0, 2, 4, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

15,1

COMMENTS

The value of K(J-90) is 483597.9 * 10^9 Hz V^-1 based on measurements in 1990. - Ralf Steiner, Jan 03 2019

2010 CODATA value is 483597.870(11) * 10^9 Hz V^-1.

The value of K(J) is 2 * e / h = 483597.848416... * 10^9 Hz V^-1 based on SI definitions (effective on May 20, 2019). - Ralf Steiner, Jan 03 2019

From Wolfdieter Lang, May 20 2019: (Start)

For the seven units of the 2019 SI system see A322415 with references.

Here only the Planck constant h = 6.62607015*10^{-34} J s, with J = kg m^2 s^(-2), and the elementary charge e = 1.602176634*10^{-19} C, with C = A s are used.

The 1990 definition of Volt with symbol V is K_{J-90} = (V s)^{-1}, where s^(-1) =  Δν_{Cs}/9192631770. (End)

LINKS

Table of n, a(n) for n=15..114.

BIPM, On the revision of the International System of Units (SI), BIPM, Nov 13-16 2018.

NIST, Josephson constant

Wikipedia, Josephson effect

FORMULA

Equals 2 * A081823 / A003676.

EXAMPLE

K_J = 2*e/h = 4.83597848416983632447658285054528135353351186600401446096974992032041797... * 10^14 A s^2/(kg m^2). - Wolfdieter Lang, May 20 2019

MATHEMATICA

RealDigits[2*(1.602176634`100*10^(-19))/(6.62607015`100*10^(-34))][[1]]

CROSSREFS

Cf. A003676 (h), A081823 (e), A248507 (inverse).

Sequence in context: A234001 A248946 A232808 * A065191 A229988 A273051

Adjacent sequences:  A248505 A248506 A248507 * A248509 A248510 A248511

KEYWORD

nonn,cons,easy

AUTHOR

Arkadiusz Wesolowski, Oct 07 2014

EXTENSIONS

Updated by Ralf Steiner, Jan 03 2019

STATUS

approved

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Last modified September 20 16:50 EDT 2021. Contains 347586 sequences. (Running on oeis4.)