The statements are about sound waves. Three words are missing. Sound waves are longitudinal waves made up of areas of greater pressure called gap 1 and areas of lower pressure called gap 2. An echo happens when a sound is gap 3. Which words should fill gaps 1, 2 and 3?
- A1: compressions; 2: rarefactions; 3: reflected
- B1: compressions; 2: rarefactions; 3: refracted
- C1: rarefactions; 2: compressions; 3: refracted
- D1: rarefactions; 2: compressions; 3: reflected