Discussion
What is a hollow cathode lamp made from?
Answer: D
The cathode is lined with the analyte metal, so sputtering and excitation produce that element's own emission lines - which is exactly what its atoms in the flame will absorb. A tungsten filament and a deuterium discharge are continuum sources, and mercury vapour would emit mercury's lines. A source built from the analyte itself guarantees a perfect match in wavelength, and the price is one lamp per element. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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