What 2 factors affect the impulse on an object in a collision?

Hydrogen and helium are both members of?

The air that we breath is made mostly of which gaseous molecule

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