Explain in 3 or 4 sentences how materials are sorted by nature.

What are similarities and differences between refraction, reflection, diffraction and absorption?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

Most short-period comets do not have randomly oriented orbits because