Which of the following statements are true regarding the effect of flame temperature on atomic absorbance and atomic emission spectroscopy?
I Varying the flame temperature by 10 K hardly affects the ground-state population of the analyte and would not noticeably affect the analyte signal in atomic absorption.
II Varying the flame temperature by 10 K hardly affects the excited-state population of the analyte and would not noticeably affect the analyte signal in atomic emission.
III Varying the flame temperature by 10 K affects the ground-state population of the analyte and will noticeably affect the analyte signal in atomic absorption.
IV Varying the flame temperature by 10 K affects the excited-state population of the analyte and will noticeably affect the analyte signal in atomic emission.
A)I and II
B)I and IV
C)II and III
D)III and IV
E)II and IV

Question

Quizplus · Accepted Answer

In atomic absorption spectroscopy (AAS), the signal is directly related to the population of atoms in the ground state, which is not significantly affected by small temperature changes such as 10 K, making statement I true. However, in atomic emission spectroscopy (AES), the signal depends on the population of atoms in the excited state, which can be significantly affected by small changes in flame temperature, making statement IV true.

Which of the Following Statements Are True Regarding the Effect