. The Becquerel rays and the properties of radium . gave a pic- ^^t- ^?-TJ^?, r^P^f <=i°g Becquerels photo- ^^^pg ^f ^^q pr^th whlcll graphs of the path of the a-rays under a magnetic ^ ^ JT force. The rays are confined into a narrow beam, and J-l-,^^ T-Qvra ViQrl TviTreiK^rl graze the plate. They are curved by the magnetic IjUe lajb lldU pUlbUtSU. force, which is supposed to work at right angles to the f-p-i -i -i plane of the paper. One branch gives the path of the ±ne WnOiC arrangC-rays when the magnetic force acts downwards, the other ill when it acts upwards. mCUt WaS plaCCQ DC- tween
. The Becquerel rays and the properties of radium . gave a pic- ^^t- ^?-TJ^?, r^P^f <=i°g Becquerels photo- ^^^pg ^f ^^q pr^th whlcll graphs of the path of the a-rays under a magnetic ^ ^ JT force. The rays are confined into a narrow beam, and J-l-,^^ T-Qvra ViQrl TviTreiK^rl graze the plate. They are curved by the magnetic IjUe lajb lldU pUlbUtSU. force, which is supposed to work at right angles to the f-p-i -i -i plane of the paper. One branch gives the path of the ±ne WnOiC arrangC-rays when the magnetic force acts downwards, the other ill when it acts upwards. mCUt WaS plaCCQ DC- tween the poles of a powerful electro-magnet. Itwas necessary to give a long exposure. After asufficient exposure, the current was sent the oppositeway through the magnet and another equal exposuregiven. On developing the plate it was found that therays had been bent by the magnetic force to a curvedpath. The two trajectories of the rays curved awayin opposite directions from the central line (fig. 19);each corresponded to a different direction of the. THE a-RAYS 77 magnetic force. By measuring the distance apart ofthe two trajectories, the deflection of the rays couldbe quantitatively estimated. The result was in goodagreement with Professor Rutherfords estimate. The result to which we have alluded, that theelectro-chemical equivalent of the a-particles is nearlythe same as for a hydrogen atom, is of very greatimportance. The electro-chemical equivalent is, as wehave seen, the quantity of electricity transported byunit mass of the substance, or, what amounts to thesame thing, the ratio of the electric charge of eachparticle to its mass. The fact that this quantity is nearly the same for ana-particle as for an atom is a strong reason for con-sidering the two to be of the same nature. On thisview the a-particle would have an atomic charge—that charge which is characteristic of a monovalentatom and, equally, of an electron. The mass of ana-particle would also be atomic in magnitude
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectradioac, bookyear1906
