This is a questions about seeing sound waves, can you explain?

Sound waves from2musical instruments are recorded, as shown in the image. (see image)

What is the difference between the sound created, they ask, but, How do you know?

B is louder because the amplitude is larger.

B is a higher note because the amplitude is larger.

A is louder because the amplitude is smaller.

A is a higher note because the amplitude is smaller.

100 50 A 0 -50 A -100 0 20 40 HO 100 Time (ms) 100 50 B AAAAAA -50 AA -100 20 40 60 100 Time (ms)