Why do you see a lemon as yellow?

Answer 1

All objects reflect the color of light that you see. Thus; lemons reflect yellow light rays, limes reflect green ones, and Oranges reflect orange light rays. On a final note, white objects reflect all colored light waves, and black objects reflect none.

With that said, the cones in your retina register these reflected light rays; thus, it makes sense that rooms without any light are black.

Answer 2

The colour of a star is determined by its effective temperature. If you imagine heating a piece of iron, it goes from red hot, to yellow hot to white hot. Our sun is "middling" hot (as stars go!) and appears yellow. Given a truly black object, like an electric stove or cast-iron pan, the temperature of the object determines the color of the object.

As stated above, the object is black. But, this is its "rest color"; which is a word that I am making up. But as heat is applied to the object, the color may change. As with the electric stove, the hotter the temperature of the stove, the difference the color is. Particularly red, orange, yellow, green, blue or violet.

Equivalently, these are the most common color of stars. Consider a star to be a ball of truly black stuff (hydrogen, helium, carbon, nitrogen, etc) and heat it up to ~4500 kelvin. Then the color associated with that temperature is yellow.

Now, your stove is not at 4500 kelvin when it is yellow, it is probably closer to 700 - 800 kelvin, but the effect of heating it up to change it's color is still applicable. But the color to temperature scale is dependent on more than just heat for the stove.

So, the sun is yellow because the molecules on its surface are hot enough for their radiation (light) to emit in the yellow band.

Answer 3

the nutrient c causes a reaction to its proteins and causes its color. by orale b

Answer 4

Lemons appear yellow because of the pigments called carotenoids in their peel. These pigments absorb certain wavelengths of light and reflect yellow, giving lemons their characteristic color.