Discussion
A source whose cathode is lined with the analyte metal is a ______ cathode lamp.
Answer: A
This is a hollow cathode lamp, so called because the cup shape confines the sputtered atoms where the discharge can excite them. Sputtering is what happens inside it rather than its name, a continuum lamp is the opposite kind of source, and heating is not how it works. The name describes the geometry that makes the arrangement efficient, and reading it literally explains why the cathode is shaped as it is. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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