Physical and astronomical constants to remember for Sikkim PSC
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 Speed of light in vacuo 

 Elementary charge 

 Neutron rest mass 

 Proton rest mass 

 Electron rest mass 

 Planck’s constant 

 Dirac’s constant 

 Boltzmann’s constant 

 Gravitational constant 

 Stefan Boltzmann constant 

 First Radiation Constant


 Second Radiation Constant 

 Permittivity of free space 

 Permeability of free space 

 Avogadro constant 

 Gas constant 

 Bohr radius 

 Bohr magneton 

 Fine structure constant 

 Solar Mass 

 Solar radius 

 Solar luminosity 

 Earth mass 

 Mean earth radius 

1 light year  Mean earth radius 

1 AU  Astronomical unit 

1 pc  Parsec 

1 year 

ENERGY CONVERSION: