What is the output of flame emission spectroscopy?

Flame emission spectroscopy is a technique used to identify the presence of specific metal ions in a sample based on the characteristic colors of light emitted when the sample is exposed to a flame. When elements are heated in this manner, their atoms gain energy, which leads to the excitation of electrons. As these electrons return to their ground state, they release energy in the form of light at specific wavelengths.

This process produces a line spectrum, which is characterized by distinct lines at particular wavelengths corresponding to the energy transitions of the ions present. Each element emits light in specific wavelengths, resulting in unique patterns or "lines" that can be used for identification. This is why the output of flame emission spectroscopy is identified as a line spectrum, which provides a clear and specific representation of the elements present in the sample.

The other options do not accurately describe the outcome of flame emission spectroscopy. A continuous spectrum indicates a smooth blend of colors without distinct lines and does not apply to this method. A solid precipitate refers to a solid that forms from a solution, which is unrelated to the emission of light. A gas is a state of matter and does not pertain to the spectral output of this technique. Thus, the correct selection reflects the specific nature of light emission from the excited