What behavior of light proves that it is a wave? Hint: Will this only happen because light is a wave, what could it also be true of fast-moving particles? A redshift and blueshift
B reflection of light
C light changes speed in glass and water
D absorption of light

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.