Sound(2)
- 1. Sound
- 2. Overview • The Facts of Sound • The Ear and Sound • Sound Vocabulary • Musical Instruments and Sound
- 3. The Facts Sound … 1. Is a form of energy produced & transmitted by vibrating matter 2. Travels in waves 3. Travels more quickly through solids than liquids or gases
- 4. The Ear • Sound is carried to our ears through vibrating air molecules. • 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. Middle Ear
- 5. Vibration - Back and forth movement of molecules of matter - For example,
- 6. Sound Waves - Alternating areas of high & low pressure in the air - ALL sound is carried through matter as sound waves - Sound waves move out in ALL directions from a vibrating object
- 7. Wavelength & Frequency - Wavelength is the distance between one part of a wave and the same part of the next wave - Frequency is the number of waves moving past a point in one second
- 8. Pitch • A measure of how high or low a sound is • Pitch depends on the frequency of a sound wave • For example, - Low pitch - Low frequency - Longer wavelength - High pitch - High frequency - Shorter wavelength
- 9. Sonar - An instrument that uses reflected sound waves to find underwater objects - For example, Animals use sonar or echo location to find their prey; these sounds have such a high pitch or frequency that the human ear cannot hear Humans use sonar to locate or map objects
- 10. Sound and Instruments - Instruments can be played at different pitches by changing lengths of different parts. - For example, - Another way to make different pitches is to change the thickness of the material that vibrates. - For example, A trombone’s mute absorbs some of the sound waves produced, thus producing a softer note when played.