What is the wavelength of these waves???

Which two particles are found in the center of an atom

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

Observations show that interstellar clouds can have almost any shape and