Question

the light given off by an electric discharge through sodium vapor is ___.
○ of a single wavelength
○ a continuous spectrum
○ white light
○ an emission spectrum

Explanation:

When an electric discharge passes through sodium vapor, sodium atoms emit light at specific wavelengths. This is characteristic of an emission spectrum. A continuous spectrum is produced by a hot, dense object (like a black - body radiator). White light is a combination of many wavelengths (a continuous range). And "of a single wavelength" is too simplistic as even simple emission spectra (like sodium's) have at least a few prominent wavelengths (sodium has a well - known doublet in its emission spectrum).

Answer:

an emission spectrum