

A229952


Decimal expansion of m_e*c in SI units (kg*m/s), where m_e is the electron mass and c is the speed of light in vacuum.


4




OFFSET

21,1


COMMENTS

The product m_e*c is also the denominator in the formula of the electron Compton wavelength: W_C = h/(m_e*c), where h is the Planck constant.
It appears that m_e*c is also the main constant in the formula of the relativistic momentum of the electron, if such formula is written as the product of a dimensionless factor and a constant with the same dimensions as the relativistic momentum. For instance, here we write p = [1/(c^2/v^2  1)^(1/2)]*m_e*c instead of the standard formula p = [1/(1  v^2/c^2)^(1/2)]*m_e*v, where v is the speed of the electron. A trigonometric version of the formula is p = tan(x)*m_e*c hence tan(x) = p/(m_e*c) assuming that sin(x) = v/c and 0 < x < Pi/2. Also p = sinh(X)*m_e*c assuming that sin(x) = tanh(X) = v/c.
Also m_e*c is the main constant in the formula of the relativistic momentum of the electron, if such formula is written as p = [(E^2/E_0^2  1)^(1/2)]*m_e*c where E is the relativistic energy and E_0 is the energy at rest.
Also m_e*c is equivalent to the momentum of a photon whose energy is the same as the rest energy of an electron.
Also m_e*c is equivalent to the relativistic momentum of an electron whose velocity is equal to c/sqrt(2). For more information see A229962.


LINKS



FORMULA



EXAMPLE

2.73092429... * 10^22 [kilogram * meter / second].


CROSSREFS



KEYWORD



AUTHOR



STATUS

approved



