Discussion
Consider the following statements about the technique.
1. Almost all atoms are in the ground state at flame temperatures
2. The source must emit the line the analyte absorbs
3. A continuum source gives better sensitivity than a line source
Which of the statements given above is or are correct?
Answer: C
The first two are correct and the third is the reverse: a continuum source would have almost all its transmitted light unabsorbed, because the atomic line is far narrower than any monochromator band. That is precisely why the line source exists. A statement inverting the reason for a technique's defining design choice is worth doubting before any detail is checked. Framing the question as which quantity the change acts upon makes the answer follow without calculation. Most errors here come from carrying a result across from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Most errors here come from carrying a result across from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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