Page 145 - Physics - XII

Appendix - III :
Appendix - III : FundamentalFundamental
Physical Constants
Physical Constants

S. No. Name Symbol Value
1. Speed of light in vacuum c 2.9979 × 10 ms –1
8
2. Charge of electron e 1.602 × 10 C
–19
3. Gravitational constant G 6.673 × 10 Nm kg –2
2
–11
4. Planck constant h 6.626 × 10 Js
–34
5. Boltzmann constant k 1.381 × 10 JK –1
–23
6. Avogadro number N A 6.022 × 10 mol –1
23
7. Universal gas constant R 8.314 J mol K –1
–1
8. Mass of electron m e 9.110 × 10 kg
–31
9. Mass of neutron m n 1.675 × 10 kg
–27
10. Mass of proton m 1.673 × 10 kg
–27
p
11. Electron-charge to mass ratio e/m 1.759 × 10 C/kg
11
e
12. Faraday constant F 9.648 × 10 C/mol
–4
13. Rydberg constant R 1.097 × 10 m –1
7
14. Bohr radius a 5.292 × 10 m
–11
0
15. Stefan-Boltzmann constant σ 5.670 × 10 Wm K –4
–8
–2
16. Wien’s constant b 2.898 × 10 mK
–3
17. Permittivity of free space ε 8.854 × 10 C N m –2
2
–12
–1
0
18. Permeability of free space µ 4 π × 10 TmA ≅ 1.257 × 10 WbA m –1
–6
–1
–7
–1
0
19. Mechanical equivalent of heat J 4.186 J cal –1
20. Standard atmospheric pressure 1 atm 1.013 × 10 Pa
5
21. Absolute zero 0 K –273.15°C
22. Electron-volt 1 eV 1.602 × 10 J
–19
23. Unifi ed atomic mass unit 1 u 1.661 × 10 kg
–27
24. Electron rest energy mc 2 0.511 MeV
25. Energy equivalent of 1u uc 2 931.5 MeV

26. Volume of ideal gas (0°C and 1 atm) V 22.4 L mol –1

27. Acceleration due to gravity (sea level, at equator) g 9.78049 ms –2

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