SOUND A NOISY SUBJECT

SOUND Compressional WAVES PRODUCED BY VIBRATING OBJECTS

CREATES A SERIES OF COMPRESSIONS AND RAREFACTIONS

SPREADS IN ALL DIRECTIONS

SPEED OF SOUND 346 m/s (760 mi/h) MEDIUM-DEPENDS ON HOW WELL THE PARTICLES CAN TRANSMIT THE COMPRESSIONS AND RAREFACTIONS OF A SOUND WAVE

TEMPERATURE AND SPEED OF SOUND HIGHER THE TEMPERATURE MORE MOLECULES COLLIDE MORE FREQUENTLY

INCREASE OF TEMPERATURE INCREASES SOUND SPEED

SOME SOLIDS DAMPEN VIBRATIONS RUBBER IS A GOOD SOUND PROOFING MATERIAL

LOUDNESS OF SOUND DEPENDS PARTLY ON ENERGY CONTAINED IN SOUND WAVE GREATER THE AMPLITUDE-THE LOUDER THE SOUND

DEPENDS ON THE DISTANCE FROM THE SOURCE INTENSITY DESCRIBES ITS LOUDNESS AT A PARTICULAR DISTANCE FROM THE SOURCE

RELATIVE INTENSITY COMPARES INTENSITY OF A SOUND WITH INTENSITY OF THE QUIETEST SOUND A PERSON CAN HEAR (THRESHOLD OF HEARING)

MEASURED IN DECIBELS (dB) Near total silence - 0 dB A whisper - 15 dB Normal conversation - 60 dB A lawnmower - 90 dB A car horn - 110 dB A rock concert or a jet engine - 120 dB A gunshot or firecracker - 140 dB

PITCH HOW HIGH OR LOW A NOTE SOUNDS

PITCH IS RELATED TO FREQUENCY HIGH PITCH VIBRATES RAPIDLY (HIGH FREQUENCY) LOW PITCH VIBRATES SLOWLY (LOW FREQUENCY)

WHAT WE CAN HEAR 20 Hz TO 20,000 Hz BELOW 20 Hz-INFRASOUND ABOVE 20,000 Hz-ULTRASOUND

MUSICAL INSTRUMENTS USE STANDING WAVES TO PRODUCE SOUND HAVE A CHARACTERISTIC SOUND QUALITY RESULTING FROM A MIXTURE OF HARMONICS

EXAMPLE: FLUTE USES A COLUMN OF AIR GUITAR-USES STRINGS

TUNING FORK VIBRATES AT ITS FUNDAMENTAL FREQUENCY PRODUCES A PURE TONE OF ONLY ONE PITCH

RESONANCE SOUND IS AMPLIFIED BECAUSE THE VIBRATION OF THE SOUND CAUSES THE OBJECT TO VIBRATE ALSO