Sound is a longitudinal wave that travels through a medium by causing compressions and rarefactions through particle vibration, without moving the medium itself. It can travel through air, solids, and liquids and its properties depend on factors like the elasticity, density, and temperature of the particular medium. When sound waves bounce off an object, it is called an echo, and sound can diffract through openings and around corners, with waves potentially interacting through constructive or destructive interference.

2. Sound is a disturbance that travels through a medium Longitudinal waves

3. Sound waves begin with a vibration Vibrations disturb nearby air particles This moving of particles causes compressions and rarefactions Page 37 Write down three examples

4. Travels through the medium without moving the medium The disturbances travel through the particles When disturbances reach your ears, you hear sound The medium can be… Air, solids, and liquids

5. When sound reflects of an object it is called an echo The harder and smoother, the more echo

6. Sound diffracts through openings Can diffract or bend around corners

7. Sound can meet and interact with each other Destructive and constructive

8. Depends on… Elasticity, density, and temperature of medium

9. The ability of a material to bounce back after a disturbance

10. Amount of matter or mass in a given space

11. Sound travels more slowly in low temps Why? Particles move slower in cold temps