Which of the following best describes the difference between flame emission and

Question

Which of the following best describes the difference between flame emission and

atomic absorption spectroscopies?

a. Emission is dependent on the fraction of atoms in their excited state, whereas absorption

is from atoms in their ground state.

b. Emission is dependent on the fraction of atoms in their ground state, whereas absorption

is from atoms in their excited state.

c. The population of atoms in the excited state is a function of the temperature of the flame.

d. Lithium and sodium are better detected by absorption, whereas beryllium and magnesium

are better detected by emission.

e. The use of an inductively coupled plasma enables greater sensitivity because of the

higher temperature available.

Explanation / Answer

Atomic Absorption measures the radiation absorbed by the unexcited atoms and it depends only on the number of unexcited atoms whereas the flame emission intensity depend upon the number of excited atoms.

Therefore answer is    (a) Emission is dependent on the fraction of atoms in their excited state, whereas absorption is from atoms in their ground state.

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