What is 150 mm expressed in diameters

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

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

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.