The London, Edinburgh and Dublin philosophical magazine and journal of science . n which a radioactive emanation is keptuniformly distributed, equal amounts of excited activity areproduced on each electrode. > ^mHa* If in series with an alternating P. D. +E0 a battery isplaced of E, less than E0, the positive carrier moves * Rutherford, Proc. Camb. Phil. Soc. 1897. the Method of its Transmission. 99 in a stronger electric field in one half alternation than in theother. A carrier consequently moves over unequal distancesduring the two half alternations, since the velocity o£ thecarrie
The London, Edinburgh and Dublin philosophical magazine and journal of science . n which a radioactive emanation is keptuniformly distributed, equal amounts of excited activity areproduced on each electrode. > ^mHa* If in series with an alternating P. D. +E0 a battery isplaced of E, less than E0, the positive carrier moves * Rutherford, Proc. Camb. Phil. Soc. 1897. the Method of its Transmission. 99 in a stronger electric field in one half alternation than in theother. A carrier consequently moves over unequal distancesduring the two half alternations, since the velocity o£ thecarrier is proportional to the strength o£ the electric field inwhich it moves. It follows from this that the excited radio-activity will be unequally distributed over the two the frequency of alternation is sufficiently great, only thepositive carriers within a certain small distance of one platecan be conveyed to it, and the rest, in the course of severalsucceeding alternations, are carried to the other plate. Suppose A and B (fig. 1) are two parallel plates to be. shM-J made radioactive. The emanation is supposed to be uniformlydistributed between them. When B is negatively chargedsuppose the P. D. between the plates is E0 —El5 when B ispositive the P. D. is E0 + E,. Let d = distance between the plates,T = time of a half alternation,p = ratio of the excited radioactivity on the plate B to the sum of radioactivity on the plates A and = velocity of the positive carriers for unit-potential-gradientOn the assumption that the electric field between the platesis uniform,- and that the velocity of the carrier is pro-portional to the electric field, the velocity of the positivecarrier towards B is E0—E: _ d and in the course of the next half alternation towards the plate A, dH2 100 Prof. Rutherford on Excited Radioactivity and The greatest distances * x^ x2 passed over by the positivecarrier during two succeeding half alternations is thusgiven by a?3 = —^H—- &
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