Color is what attracts bees to flowers.
The bees then spread pollen to flowers
and help them to grow. Humans use
the colors as traffic siglals. Red signal
tells drivers to stop. Cops, students, nurses
in hospitals, lawyers, soldiers all wear uniforms
of different colors.Red,blue and yellow are called
primary colors. A primary color cannot be made
by mixing other colors. Orange , green and purple
are called secondary colors. Secondary colors are
made by mixing two primary colors.
Colors are part of light. Light is a kind of energy,
which travels through the air in invisible waves
callled light waves. Light bends when it passes
through a prism. As the light bends, each color
goes in different direction.
Sunlight has the same amount of all the colors.
Each color makes its own kind of light waves.
During the day, the sun is positioned high in
the sky, and emits light at a relatively short
angle to the earth. So the blue /violet color with
the shortest wavelengths only enter the atmosphere.
The collision with the oxygen and nitrogen atoms in
the atmosphere, make them scattered. But because
our eyes are more sensitive to blue light, than they
are violet light, we perceive the sky as blue. During
sunrise or sunset the sun emits light at a longer angle.
So only the longer yellow, orange/red light is visible.