This n' That

Physical Constants:

Symbol Details Value (MKS)
c Speed of light in vacuum 2.99792458 x 108 ms-1
h Planck's Constant 6.6260755(40) x 10-34 Joule-s
k Boltzmann's Constant 1.380658(12) x 10-23 JouleK-1
e Elementary Charge 1.60217733(49) x 10-19 Coulomb
m Electronic Mass 9.1093897(54) x 10-31 kg
m Mass of a proton 1.6726231(10) x 10-27 kg
m Mass of a neutron 1.6749286(10) x 10-27 kg
m Mass of a Hydrogen atom 1.6735 x 10-27 kg
G Gravitational Constant 6.67259(85) x 10-11 New m2 kg-2
NA Avogadro's Constant 6.0221367 x 1023 mol-1
amu Atomic Mass Unit 1.6605402(10) x 10-27 kg
a Fine Structure Constant 7.29735308(33) x 10-3
R Rydberg Constant 10973731.534(13) m-1
ao Bohr's Radius 0.529177249(24) x 10-10 m
h / (mc) Compton Wavelength of electron 2.42631058(22) x 10-12m
sigmaT Thomson Cross-section 0.66524616(18) x 10-28m2
e2 / (mc2) Classical Electron Radius 2.81794092 x 10-15 m
R Molar Gas Constant 8.314510(70) Joule mol-1 K-1
sigma Stefan-Boltzmann Constant 5.67051(19) x 10-8 Joule m-2s-1K-4

Astrophysical Constants:

Symbol Details Value
A.U. Astronomical Unit 1.49 x 1011 m
pc Parsec 3.09 x 1016 m
l.y. Light Year 9.46 x 1015 m
Msun Solar Mass 1.989 x 1030 kg
Rsun Solar Radius 6.96 x 108 m
Lsun Solar Luminosity 3.83 x 1026 Joule s-1
ME Mass of Earth 5.97 x 1024 kg
RE Equatorial Radius of Earth 6378.1 km
Earth-Moon distance 384403 km
MM Mass of Moon 7.35 x 1022 kg
RM Radius of Moon 1738 km

Comparing Synthesis Imaging Instruments:

Some parameters of GMRT, VLA, WSRT and ATCA are tabulated here .



Celestial Events:




ngk@ncra.tifr.res.in
Last revised: Tue Sep 26 16:36:33 2000

Contact: www@ncra.tifr .res.in

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