Discussion
Flame emission spectroscopy differs from atomic absorption in measuring light
Answer: B
Correct answer: emitted by excited atoms in the flame
In flame emission the flame both atomises the sample and excites a fraction of the atoms thermally; the light they emit as they relax is measured, and no lamp is required. Atomic absorption measures instead the light removed from an external beam by the far larger population of ground-state atoms, which is why it is generally the more sensitive of the two for elements of high excitation energy.
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