11. A balloon contains 7.2 L of He. The pressure is reduced to 2.00 atm and the balloon
expands to occupy a volume of 25.1 L. What was the initial pressure exerted on the
balloon?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this