Consider the following statements about the properties of sound:
1. Sound is a form of energy.
2. Sound can travel in a vacuum.
3. Sound travels faster in solids than in liquids.
4. Sound requires a medium to travel.
1
1, 2, & 3 are true
2
2, 3, & 4 are true
3
1, 3, & 4 are true
4
All are true