Mourning doves have a small patch of iridescent feathers. The color is produced by a 330-nm-thick layer of keratin (n = 1.56) with air on both sides that is found around the edge of the feather barbules. For what wavelength or wavelengths in the visible spectrum would this structure produce constructive interference?

ice to water 1 water to vapour 2 latent heat

it has to be b, about 97 percent.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.