A sound wave moves through air as alternating compressions and rarefactions. Which row correctly compares the air pressure in a compression and the air pressure in a rarefaction with the air pressure in a nearby region where no sound wave is present?
- Acompression: higher; rarefaction: higher
- Bcompression: higher; rarefaction: lower
- Ccompression: lower; rarefaction: higher
- Dcompression: lower; rarefaction: lower