1. What are the interactions sound waves undergo?

2. Reflect/Absorb

3. *reflection: the bouncing of sound off of a surface

4. *absorption: the disappearance of a sound wave into a surface

5. *The harder the surface, the more sound is reflected.

6. *The softer the surface, the more sound is absorbed.

7. Echo…Echo…Echo…Echo

8. echo: a reflected sound wave

9. Echo = Communication

10. sonar and echolocation are both the finding of an object using reflected sound

11. *echolocation= dolphins, bats
So…What’s the difference between sonar and echolocation?
*sonar = ships, submarines
Warships using sonar to find submarines. It’s thought the war ships sonar disrupts dolphins ultrasound system.
*echolocation= dolphins, bats

13. Resonance
A phenomenon that occurs when two objects naturally vibrate at the same frequency.
The sound produced by one object causes the other object to vibrate.
Musical instruments use resonance to generate sounds. An acoustic guitar has a hollow body that amplifies the sounds.

14. Interference
Constructive interference-when a compression from one wave overlaps the compression of another wave.
Destructive interference-the compression of one wave overlaps the rarefaction of another wave.

15. Sound Waves Videos: Echoes
“The Boy Who Could See Like a Bat” (3:53)
Real Life Bat Man (2:54)
“Quack Science” video on discovery education (21 min)