Physical Constants

Symbol

Definition

V alue*

q

electronic charge

1.602176462(63) x 10-19C

m0

electron rest mass

9.10938188(72) x 10-28g 9.10938188(72) x 10-31 kg

П

circle circumference to diameter (calculable)

3.14159265358979…

c

velocity of light in vacuum (exact value)

2.99792458 x 1010 cm/s

2.99792458 x 108 m/s

£o

permittivity of vacuum (exact value)

8.854187817.. . x 10-14 F/cm

8.854187817.. . x 10-12 F/m

h

Planck constant

6.62606876(52) x 10-27 erg-s 6.62606876(52) x 10-34 J-s

h-

reduced Planck constant (h/2n)

1.054571596(82) x 10-27 erg-s 1.054571596(82) x 10-34 J-s

k

Boltzmann constant

1.3806503(24) x 10-16 erg/K 1.3806503(24) x 10-23 J/K

о

Stefan-Boltzmann constant [2n5k4/(15h3c2)]

5.670400(40) x 10-12 Wcm-2K-4 5.670400(40) x 10-8Wm-2K-4

kT/q

thermal voltage

0.025852027(44) V (at 300K) 0.025692606(44) V (at 25°C)

A1eV

wavelength in vacuum for 1 eV photon (hc/q)

1.23984186(11) pm

SR1pm

ideal spectral responsivitity for 1 pm photon (qA/hc)

0.806554477(70) A/W

* Reference: P. J. Mohr and B. N. Taylor, J. Phys. Chem. Ref. Data, Vol. 28, pp. 1713­1852, 1999 (digits in parentheses are the estimated one-standard-deviation uncertainty in the two last digits of the given value).

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