. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. -4476*7460-1438-0417-3 669 942 642 915 624 897 594 867 573 846 553 826 531 804 507 780 488-5 761-5 463 736 440 713 10 -615 10 -929 11 -14811 -584 11 -820 12 -10712 -438 12 -821 13 -123 13 -587 14 -025 7 -98497 -76397 -3394 7 -0268 8 -5000 8 -0026 9 -399010 -8405 10 -3848 11 -7696II -3166 12 -0368IS -8411IS -4338IS -1507 14 -6452li -1687 15 -6885 15 -056318 -5215 16 -0358If -6104 370 Dr. W. Wilson. The Complete Photo-electric logarithms of the photo-electric currents and the common logarithms of thephoto-electric cur
. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. -4476*7460-1438-0417-3 669 942 642 915 624 897 594 867 573 846 553 826 531 804 507 780 488-5 761-5 463 736 440 713 10 -615 10 -929 11 -14811 -584 11 -820 12 -10712 -438 12 -821 13 -123 13 -587 14 -025 7 -98497 -76397 -3394 7 -0268 8 -5000 8 -0026 9 -399010 -8405 10 -3848 11 -7696II -3166 12 -0368IS -8411IS -4338IS -1507 14 -6452li -1687 15 -6885 15 -056318 -5215 16 -0358If -6104 370 Dr. W. Wilson. The Complete Photo-electric logarithms of the photo-electric currents and the common logarithms of thephoto-electric currents divided by the squares of the absolute temperatures. In order to test the validity of equation (1), which represents the expectedrelation between the complete photo-electric emission and the temperature ofthe radiator, it is convenient to put in the following form :— 1 c log A (4) from which it will be seen that there is a linear relationship between log C/T^and 1/T. These two quantities are plotted in fig. 9 from the results given in 5- 4- 3- 2- ??ii»— 3 I 0. T X 10 II 12Fia. 9. 13 j4 Table III (X being taken to be 2). The points, as will be seen, lie very close to a straight line over the whole of the very wide range of the photo-electric currents given in the Table. The logarithm of the largest current exceeds that of the smallest by 4*668 approximately, so that the extreme values of the currents differ by a factor of 46600. The tangent of the angle, under which the straight line in fig. 9 meets the horizontal (1/T) axis, is to a close approximation 4/3, and therefore, by equation (4) ^ ^ 4 X 10^ h 3 X 0-4343 Emission from the Alloy of Sodium cbnd Potassium, 371 0 = ^^^y^^^x 10-1^ ergs, where 0*4343 is logio e. The entropy constant k is known to be 1*34 x 10 ^^ergs per degree, so that we get 4 X 1-343 X 0-4343 , ^ = 4-02 X 10~i2 ergs, or ^ = 4-02 X 10-1^ joules. For the purpose of comparison with thermionic or other measurements of 0, it will be convenient to g
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