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Moseley's Law

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Points of Emphasis

Prerequisites

Lab Activities

Through a study of x-ray absorption edges, the regularity of the characteristic x-ray line spectra of the elements is demonstrated. Specifically, the students take data which confirms Moseley's claim that it is more fundamental to order the elements by atomic number than by atomic weight; and they use the regularity of the energies of the absorption edges to identify the elements in three unknown filters.

Course Level

Intermediate: P49

Student Handouts

Equipment

Number of set-ups available: 1

Per lab station:

1 Tel Atomic x-ray machine
1 film badge per student
1 Geiger tube
1 Tel Atomic scaler
1 rotating radiator
1 iron filter
1 chromium filter
1 manganese filter
1 vandium filter
1 zinc filter
1 copper filter
1 nickel filter
1 cobalt filter
1 stopwatch

Apparatus

Notes


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