Answer to Question 1
Because incandescent light contains a higher ratio of reds and oranges, these colors
predominate when seen under this type of light. Most objects have a warm
coloration when seen under incandescent light. Fluorescent light often contains
higher ratios of blue and green; a cooler appearance is observed because of the
domination of these shorter wavelength colors. Modern cool white fluorescent
lamps do not produce this effect as much as older or less expensive fluorescent lamps
do. The newer tubes have been carefully color-corrected by adjusting the phosphors
found on the inside of the tube to give off light that more closely approximates
noontime sunlight and is thus closer to incandescent light.
Answer to Question 2
Pigments of cyan and magenta are not found naturally and are not easy to
manufacture. However, red and blue pigments are readily available. This means that
red and blue have been used traditionally by artists as their primary colors. A wider
range of colors could be mixed by painters if cyan, magenta, and yellow were used,
but the availability of pigment had led to the continued use of red, blue, and yellow
as the primary colors in the artist's subtractive theory.
Evidence that Light Travels at a Finite Speed
Scheme of the principle of the fluorescent in situ hybridization to localize a gene in the nucleus.
Apply light tapotement on the head. Tapping lightly with the fingertips works well for this purpose.
Light Vehicle Diesel Engines
Speed of Light in Different Mediums
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum