Sound Study Guide

Sound

1. Sound is energy produced created by vibrations.
2. Sound cannot travel in a vacuum; it must travel through matter.
3. Sound travels through matter in compression waves.
4. Each molecule of matter passes the vibrations on to the next molecule.
5. Sound travels through solids, liquids, and gases
6. Sound travels fastest through solids because the molecules in solids are close.
7. Sound that is bounced off an object is reflected, and this creates an echo
8. A process for measuring ocean depth is sonar
9. When sound waves are trapped or are not able to travel any further, they are absorbed
10. Sound waves that pass through a material are transmitted
11. Frequency=pitch
12. Close waves=high pitch
13. Short pipe or tight strings on instruments=high vibrations
14. Long pipe or loose strings on instruments=low vibrations
15. Volume is measured in decibels
16. Sound travels slower than light
17. Resonance is when the air in a guitar starts to vibrate along with the strings
18. Two very special ways of making sounds are Morse code and Sonar

1. Morse code is a code that uses short and long taps of a metal transmitter to represent the letters of the alphabet. It is often used by large boats/ships

2. Sonar is a system that uses transmitted and reflected sound waves to learn how far away an object is in the water. This is used by submarines. Bats also use sonar to find food.