PHYSICS..SOME IMPORTANT PHYSICAL CONSTANTS

Mass of an electron (Me) = 9.1x10
-31
kg.
2.  Mass of a proton ( Mp) = 1.6725 x 10
-27
kg.
3.  Mass of a neutron (Mn) = 1.6746 x 10
-27
kg.
4.  Charge of an electron (e) =-1.6 x 10
-19
c
5.  Speed of light in vacuum (c) = 3 x10
8
m/sec.
6.  Planck Constant (h) = 6.6256 x 10
-34
J x sec .
7.  Universal Gravitation constant (G) = 6.67 x 10
-11
Nm
2
/ kg
2.
8.  Avogadro Number (NA) = 6.023 x10
23
mol
-1
.
9.  Boltzmann constant (K) = 1.38 x 10
-23
J/K

10.Radius of the earth (Re) = 6400 Km. = 6.4x10
6
m