XXth century_physics
XXth century_physics XXth century_physics
”The wavelengths of the first four hydrogen lines are obtained by multiplying the fundamental number b = 3645.6 in succession by the coefficients 9/5, 4/3, 25/21 and 9/8. At first it appears that these four coeffcients Johann do not form a regular series; but if we multiply the numerators Balmer in the second and the fourth terms by 4 a consistent regularity is evident and the coefficients have for numerators the numbers 32 , 42 , 52 ,62 , and for denominators a number that is less by 4. Hence I finally arrived at the present formula for the coefficients in the more general form: m2 /(m2 - n2 ) in which m and n are whole numbers.” Formula Measurement Difference H α 6562.08 6562.10 +0.02 H β 4860.8 4860.74 –0.06 H γ 4340 4340.1 +0.1 H δ 4101.3 4101.2 –0.1 Balmer, Ann.d. Phys. u. Chem. (1885)
Johann Balmer λ = bm 2 /(m 2 - n 2 ) n = 2, m = 3, 4, 5... b = 3645.6 Balmer’s formula (1885)
- Page 1 and 2: Physics of the XX th century Part 1
- Page 3 and 4: Physics of the atom and the path to
- Page 5 and 6: Hantaro Nagaoka Nagaoka's atomic mo
- Page 7 and 8: Robert Millikan (1868-1953 (1868 19
- Page 9 and 10: Charles Glover Barkla (1877-1944) d
- Page 11 and 12: John William Nicholson (1911): atom
- Page 13 and 14: Accelerated electric charge radiate
- Page 15 and 16: Attenuation of radiation for rings
- Page 17 and 18: Solvay Conference 1913
- Page 19 and 20: H. Geiger - On the Scattering of th
- Page 21: Proc. Roy. Soc. 82, 495 (1909)
- Page 24 and 25: In the ”plum-pudding” model of
- Page 26 and 27: "Consider an atom which contains a
- Page 28 and 29: ”...considering the enormous vari
- Page 32 and 33: Spectral lines were seen as manifes
- Page 34 and 35: In the Bohr’s model spectral line
- Page 36 and 37: Bohr found excellent description of
- Page 38 and 39: Periodic system of elements accordi
- Page 40 and 41: Periodic system of elements accordi
- Page 42 and 43: Intra-atomic Charge ”Now, accordi
- Page 44 and 45: H. G. J. Moseley, Phil. Mag. 26, 10
- Page 46 and 47: ”We have here a proof that there
- Page 48 and 49: James Franck Gustav Hertz Franck-He
- Page 50 and 51: James Franck Gustav Hertz ”...it
- Page 52 and 53: Wojciech (Adalbert) Rubinowicz (188
- Page 54 and 55: Solvay Conference 1921
- Page 56 and 57: Arthur Holly Compton (1892-1962) Co
- Page 58 and 59: Compton’s data [(Phys. Rev.19, 26
- Page 60 and 61: Compton effect
- Page 62 and 63: The crisis of the quantum theory
- Page 64 and 65: Louis de Broglie
- Page 66 and 67: Clinton Davisson and Lester Germer
- Page 68 and 69: George P. Thomson Electron diffract
- Page 70 and 71: Important dates in the development
- Page 72 and 73: Heisenberg to Pauli (July 9, 1925)
- Page 74 and 75: ”It is well known that the formal
- Page 76 and 77: ”In this communication I wish fir
- Page 78 and 79: The uncertainty principle
Johann Balmer<br />
λ = bm 2 /(m 2 - n 2 )<br />
n = 2, m = 3, 4, 5...<br />
b = 3645.6<br />
Balmer’s formula (1885)
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