A low-pressure discharge lamp used in a laboratory emits three strong spectral lines at the following vacuum wavelengths:
• 486nm
• 589nm
• 656nm
A student investigates the lamp’s emission through various optical elements.
(1) Part 1: (a) Determine the perceived color associated with each of the three spectral lines.
(2) Part 2: (b) Identify which of the three lines has the greatest frequency and justify your answer without performing an explicit numerical calculation.
(3) Part 3: (c) The lamp is viewed through an optical filter that transmits only wavelengths in the range 430nm≤λ≤510nm. Indicate which, if any, of the three spectral lines will be visible after the filter and state the resulting observed color(s).