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

By Anthony Philip French Edwin F.Taylor

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The ordinate is actually the retarding voltage required to stop the photo- The slope of the straight line directly gives the maK on v. Note Millikans computation of current. dependence of h in the lower right corner of the figure. [Figure taken from R. A. Millikan, Phys. Rev. 7, 355 (1916). ] measurements on the process, obtained by R. A. Millikan in 1916. The energy K max does not depend at all on the intensity of the incident light, only on its frequency. ) Moreover, below a minimum "threshold" frequency v for the incident light, sity no electrons are ejected of the incident teristic light.

The at the sur- height of this step measures the tenacity with which the metal confines values for different metals. work function of the metal and electrons and has different its The is step height typically a W is called the few electron-volts. Even the most energetic electrons will not leave the metal if they do not receive an energy in excess of the work function —a fact frequency v explains that = W\h below the existence of a threshold which no electrons are emitted. Ac- cording to the photon model, then, the maximum-energy electrons will have an energy given by the expression K max = hv-W = h{v-v which fits the experimental linear curve of Figure 1-8.

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.

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