Question

the drawing is a __ spectrum, and indicative of a(n) __ light source. 400 500 600 700 continuous; incandescent line; incandescent continuous; fluorescent line; fluorescent

Explanation:

A line spectrum consists of discrete lines of specific wavelengths. Fluorescent light sources produce line spectra. Incandescent sources produce continuous spectra (a continuous range of wavelengths). The given spectrum has discrete lines (not a continuous band), so it is a line spectrum. Fluorescent is the correct light - source type for a line spectrum among the options.

Answer:

line; fluorescent