wave without a medium. series of compressions only. pattern of up and down vibrations. pattern of compressions and rarefactions.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Sound travels as a
Possibilities:
- wave without a medium.
- series of compressions only.
- pattern of up and down vibrations.
- pattern of compressions and rarefactions.

pattern of compressions and rarefactions.