In 1814 Fraunhofer Observed a Series of Dark Lines in the Sun's

Multiple Choice

In 1814 Fraunhofer observed a series of dark lines in the sun's spectrum, which he labeled A through H. About 50 years later, Gustav Kirchhoff noticed that the wavelength of light given off when sodium salts are added to a flame is the same as the wavelength of the D line in Fraunhofer's spectrum. He concluded that certain substances give off light when heated that has the same wavelength as the light absorbed under other conditions. The wavelength of the characteristic yellow-orange light emitted by sodium ions in a burner flame is 589.5923 nm. What is the energy of this light, in units of kJ/mol?

A) less than 1 kJ/mol
B) between 1 and 10 kJ/mol
C) between 10 and 100 kJ/mol
D) between 100 and 1000 kJ/mol
E) more than 1000 kJ/mol