# Physical and astronomical constants to remember for IBPS SO

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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: