Constants > Physics > Subatomic Particles

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NAME SYMBOL VALUE
Proton-Tau Mass Ratio mp/mτ 0.527994(86) 
Quantum of Circulation h/2me
h/me
3.636947516(27) × 10-4 m2 s-1
7.273895032(53) × 10-4 m2 s-1
Radius, Bohr a0 5.291772083(19) × 10-11 m
Rydberg Constant α2mec/2h R
Rc
Rhc
10973731.568549(83) m-1
3.289841960368(25) × 1015 Hz
2.17987190(17) × 10-18 J
Shielded Proton Gyromagnetic Ratio 2µp/ħ (H2O, sphere, 25°C) γ'p
γ'p/2π
2.67515341(11) × 108 s-1 T-1
42.5763888(18) MHz T-1
Shielded Proton Magnetic Moment (H2O, sphere, 25°C) µ'p
µ'pB
µ'pN
1.410570399(59) × 10-26 J T-1
1.520993132(16) × 10-3 
2.792775597(31) 
Tau Compton Wavelength λC,τ 0.69770(11) × 10-15 m
Tau Mass mτ 3.16788(52) × 10-27 kg
1.90774(31) u
Tau Molar Mass NAmτ M(τ)
Mτ
1.90774(31) × 10-3 kg mol-1
Tau-Electron Mass Ratio mτ/me 3.47760(57) 

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