Download An Introduction To Quantum Physics by Anthony Philip French Edwin F.Taylor PDF

By Anthony Philip French Edwin F.Taylor

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The posi- of the Balmer tion limit is (b) marked, Balmer spec- I H trum employing a fi H ( I H«H 7 (a) higher dispersion, in which individual lines to can be seen up about n = 20. , New Continuum York, 1944. ) In 1885 Hn Red He Hy Turquoise Blue //« Violet //< Extreme Balmer9 J. J. ) of course did not supply a key to the actual mechanism of atomic radiation. A very important clue was provided by the reciprocal of X It was found 9 15 1-5 J. J. that was a more if significant quantity than k itself.

Equation 1-24 the in Hz). An important further extension if is is then replaced by relation Ann. Phys. Lyman, Phys. Rev. Nature 3, 109, 27, 565 (1908). 504 (1914). 209 (1922); H. A. Pfund, J. Opt Soc. Am. 193 (1924). 29 1-8 Further predictions of the Bohr model 9, ,. Bohr (— -, - series for n f = 4, //, - 6, 8, 10 //, . ) =5, putting this, 7 6, . . Q= (He *) 2e, and that the He^ would have alternate lines coincident with the Balmer series. Such a spectrum had been observed from stars but not previously known on associated with a substance 1-9 (1-25) Cgs) realized that the spectrUm of singly ionized helium could be calculated from (for — earth.

Cycles/sec) we can measure wavelengths through gratings, , . 602 x 10 ,2 erg It is also standard practice to express the wavelengths k of atomic spectra in angstroms. It is therefore convenient to express the quantities h and he in corresponding units. 136 x 10~ 15 eV-sec hc= We 12,400 (1-11) eV- can then rewrite Eq. 0 eV, indicating the appropriateness of the electron volt as an energy unit for photons in the visible region. When Einstein first introduced the photon concept, he had very limited evidence with which to support been richly confirmed, however, and we list of evidence that indicate the validity of E it.

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