Some Physics questions regarding circuits and electricity.

Determine the maximum r-value of the polar equation r =3+3 cos 0

Awalk up the phase change graph worksheet

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