Discussion
A hollow cathode lamp is used in atomic absorption because it emits
Answer: A
Correct answer: the sharp resonance lines of the element sought
Atomic absorption lines are extremely narrow, so a continuous source filtered by an ordinary monochromator would deliver mostly light the atoms cannot absorb, and the sensitivity would be hopeless. A hollow cathode lamp whose cathode is made of the element emits exactly the lines that element absorbs, and narrower than the absorption profile. The price is that a separate lamp is needed for each element.
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