Question

A student takes notes in class.

Sound Waves
I. Created by a vibration
A. Vibration: something that causes air molecules to move
back and forth quickly and steadily
II. Move through a medium
A. Solid
B. Liquid
C. Gas

Which line of her notes contains an error?

I
I A
II B
II C

Answer 1

I A

Reason: A vibration is the back-and-forth motion of an object or particles themselves, not specifically "something that causes air molecules" to move. Also vibrations occur in any medium (solids, liquids, gases), not only air.