1. Chapter 12, Section 4 Using Sound

2. Acoustics
Acoustics is the study of sound.
reverberation is when sound reflects many times and produces multiple echoes.
too much reverberation can ruin a music concert.
scientists and engineers prevent this by specially designing concert halls

3. Concert halls should have:
“Good” Acoustics
Concert halls should have:
rounded walls
soft materials (draperies, carpeting)
furniture and other structures
All of these items will reduce reverberation.

4. http://images. artnet. com/artwork_images_851_430921_takeshi-yamada

5. http://www. artecconsultants

6. Echolocation
Echolocation is the process of locating objects by making sounds and interpreting the sound waves that are reflected back.
Bats and dolphins use this to move around in the dark and to locate prey.

8. SONAR
SONAR is a human-made system that uses the reflection of underwater sound waves to detect objects
SONAR stands for SOund Navigation And Ranging
the ultrasonic sound wave travels through water and is reflected when it hits something solid.

9. http://www. pacificwhale

10. mapping the ocean floor
Uses of SONAR
military
finding shipwrecks
fishing
mapping the ocean floor

11. Ultrasound in Medicine
cleaning glassware & instruments—sound breaks up dirt
ultrasound machines can detect & monitor conditions such as pregnancy, heart disease & cancer
the ultrasonic wave travels through the body & is reflected by soft tissues

12. Ultrasound Machine

13. Ultrasound in Medicine
the reflected waves produce electrical signals
a computer program converts the electrical signals into a video image called a sonogram

14. Treating with Ultrasound
kidney stones (hard deposits of calcium compounds in the kidneys) can be broken up into small pieces using short bursts of ultrasonic waves
the fragments pass out of the body in the urine
patient does not have to have surgery as a result