SOUND SOUND KEY TOPICS NATURE OF SOUND AUDIO SPECTRUM RESONANCE & FORCED VIBRATION INTERFERENCE REFLECTION & REFRACTION SOUND SOUND ANIMATION DEMO SOUND LONGITUDINAL WAVES ON A SLINKY DEMO SOUND SOUND IS THE COHERENT VIBRATIONS OF ATOMS OR MOLECULES IN SOLIDS, LIQUIDS AND GASSES.
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INFRASOUND < 20 HZ
ULTRASOUND >20 KHZ
fb = fl - fs
THE QUALITY OF A SOUND IS DETERMINED BY THE INTENSITY OF THE HARMONICS PRESENT.
The PHET simulator “FOURIER: MAKING WAVES” can be used to show how the quality can be changed by varying the harmonics present.
THE SOUND IS THAT NORMALLY REFLECTED OUTSIDE OR IN LARGE ENCLOSED AREAS SO THAT THE REFLECTED SOUND CAN BE DISTINGUISHED FROM THE SOURCE.