ch44_p38 - 38. We note from track 1, and the quantum...

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38. We note from track 1, and the quantum numbers of the original particle ( A ), that positively charged particles move in counterclockwise curved paths, and by inference — negatively charged ones move along clockwise arcs. This immediately shows that tracks 1, 2, 4, 6, and 7 belong to positively charged particles, and tracks 5, 8 and 9 belong to negatively charged ones. Looking at the fictitious particles in the table (and noting that each appears in the cloud chamber once [or not at all]), we see that this observation (about charged particle motion) greatly narrows the possibilities: tracks 2,4,6,7, particles , , , tracks 5,8,9 particles , , CFHJ DEG This tells us, too, that the particle that does not appear at all is either B or I (since only one neutral particle “appears”). By charge conservation, tracks 2, 4 and 6 are made by particles with a single unit of positive charge (note that track 5 is made by one with a single unit of negative charge), which implies (by elimination) that track 7 is made by particle H . This is confirmed by examining charge conservation at the end-point of track
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ch44_p38 - 38. We note from track 1, and the quantum...

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