An icepack contains ammonium nitrate. when this is dissolved in water it gets considerably colder. this is an
example of heat energy being converted into
energy.

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