Frequently used physical and Constants for Sikkim PSC
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Frequently used constants:
Constant | Symbol | Value |
Alpha particle mass |
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Avogadro constant |
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Boltzmann constant |
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Electron mass |
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Electron volt |
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Electronic charge |
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Faraday constant |
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Gravitational constant |
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Neutron mass |
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Permeability of free space |
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Permittivity of free space |
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Planck constant |
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Proton mass |
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Proton-electron mass ratio |
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Speed of light |
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Universal gas constant |
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Particle physics:
Class | Name | Symbol | Mass | Mean life | Year of discovery |
Leptons | Electron Neutrino Muon Tau |
| 1
207 3500 | Stable Stable
| 1897 1957 1937 1975 |
Mesons | Pi meson K meson |
| 273 264 ≈970 |
? | 1947 1947 1947 |
Baryons | Proton Neutron Lambda Sigma Chi omega |
| 1836 1839 2183 2327 2573 3272 |
| 1897 1932 1947 1953 1954 1964 |