This document provides an overview of sound, including that it is a form of energy transmitted through vibrating matter as waves. It travels more quickly through solids than liquids or gases. The ear detects sound waves as pressure changes that are transmitted to the brain. Musical instruments produce sound through vibration and can change pitch by varying the length, thickness, or addition of mutes to the vibrating material.

1. Sound

2. OverviewThe Facts of SoundThe Ear and SoundSound VocabularyMusical Instruments and Sound

3. The FactsSound …Is a form of energy produced & transmitted by vibrating matterTravels in wavesTravels more quickly through solids than liquids or gasesA wave is a repeating disturbance or movement that transfers energy through matter or space

4. The water waves below are carrying energy. Waves can only exist as they have energy to carry.

5. The EarSound is carried to our ears through vibrating air molecules.

6. Our ears take in sound waves & turn them into signals that go to our brains.Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.

7. The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.

8. Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.

9. The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.VibrationBack and forth movement of molecules of matter

10. For example,CompressionWhere molecules are being pressed together as the sound waves move through matter

11. For example,

12. a wave travels through the springs just like sound waves travel through the air

13. the places where the springs are close together are like compressions in the air.Sound WavesAlternating areas of high & low pressure in the air

14. ALL sound is carried through matter as sound waves

15. Sound waves move out in ALL directions from a vibrating objectWavelength & FrequencyWavelength is the distance between one part of a waveand the same part of the next wave

16. Frequency is the number of waves moving past a point in one secondFrequency is the number of waves (vibrations) that pass through a point in one second.Period is the time it takes for one full wavelength to pass a certain point.Frequency is waves per second.Period is seconds per wave.