Discussion
Why is atomic absorption less sensitive to flame temperature than emission?
Answer: D
Since almost every atom is already in the ground state, a change in temperature moves that population hardly at all, while the tiny excited population that emission relies on changes by a large factor. Flame emission is chopped out rather than subtracted automatically, the lamp compensates for nothing, and absorption certainly depends on atom number. Measuring a quantity that is already near its maximum makes a method robust against the variable that determines it.
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