You chose wisely. The two waveforms are moving at the same speed and the crests are the same distance apart. But the lower crests likely seem more compact than the upper ones, and the air molecules in the lower graph are moving more quickly than the ones in the upper graph. This sound has a greater amplitude and would sound louder than the upper sound.

Next we will introduce you to a device that can help us to visualize sounds, known as an oscilloscope.