What topic is the teacher most likely talking about

Compare these two waves : a. the blue wave has a higher pitch, but the orange wave is louder. b.the blue and orange waves have the same volume, but the blue wave has a higher pitch. c.the blue and orange waves have the same pitch, but the blue wave is louder. d.the orange wave has a higher pitch, but the blue wave is louder.

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball