Transactions and proceedings and report of the Royal Society of South Australia (Incorporated) . Fvg. 2 * Thil. Mag., December, 1904, p. 737. Jahrbuch d. Rad. n. Elektr., 1905, p. 14. 14. PhotographicPlate Re consequently, so to speak, a large penumbra. Thus thetrace upon the plane of the paper of all the a rays is suchas is represented in Fig. 3, the deflections being all exag-gerated so as to be capable of depiction. Now suppose an aluminiumplate is placed, as in M. Bec-quereFs experiment, over the slit,so that the a particles have to passthrough it on the way to the photo-graphic plate. M.
Transactions and proceedings and report of the Royal Society of South Australia (Incorporated) . Fvg. 2 * Thil. Mag., December, 1904, p. 737. Jahrbuch d. Rad. n. Elektr., 1905, p. 14. 14. PhotographicPlate Re consequently, so to speak, a large penumbra. Thus thetrace upon the plane of the paper of all the a rays is suchas is represented in Fig. 3, the deflections being all exag-gerated so as to be capable of depiction. Now suppose an aluminiumplate is placed, as in M. Bec-quereFs experiment, over the slit,so that the a particles have to passthrough it on the way to the photo-graphic plate. M. Becquerel sup-poses that there ought therefore tobe an increased displacement of thephotographic image. But this isnot so. The path of any one aparticle is slightly deflected, butthe whole trace is not appreciablydisturbed. The aluminium dimin-ishes the range of every a particleby the same amount, but the onlyresult is to cut off all the rays whichwould have gone past a certainpoint, say Q, and to cause them totake the places of those rays which Fig. 3 fell short of Q; these latter being further shortened. This does not in the least affect the posi-tion of the outer edge of the tr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1906
