Light travels three-fourths as fast through water as it does through a vacuum. What is water's index of refraction?

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

What does the symbol (–hfus) indicate in a phase change?

Consider the story you just read. all but one of the choices below indicate that something is living.