H2 Wave Properties of Sound

This section demonstrates the effects of the wave nature of sound, including interference, beats, resonance, and the Doppler effect.

Articles
Image	Title
	H2-01: FOCUSING OF SOUND WITH CONCAVE REFLECTORS Demonstrate how sound waves can be focused by concave reflectors.
	H2-02: PARABOLIC MICROPHONE Show what a parabolic microphone is and to demonstrate its sensitivity individually.
	H2-03: ACOUSTIC RADAR Illustrate how RADAR and SONAR work
	H2-11: SOUND LENS Demonstrate focusing of sound by refraction in a sound lens
	H2-21 AUDIBLE YOUNG'S EXPERIMENT - GROUP LISTENING Demonstrates interference of sound waves with two coherent sources
	H2-22: INTERFERENCE - TRANSPARENCIES An optical analog to the interference pattern from two identical sound sources.
	H2-24: AUDIBLE YOUNG'S EXPERIMENT - MIC AND SCOPE Demonstrate interference of sound with two coherent sound sources in a quantitative way.
	H2-25: QUINCKE'S INTERFERENCE TUBES Demonstrate interference of sound waves in a perhaps surprising way.
	H2-26: PHASE REVERSAL BETWEEN STEREO SPEAKERS - MUSIC Demonstrate interference of sound in a dramatic way.
	H2-27: PHASE REVERSAL BETWEEN STEREO SPEAKERS - OSCILLATOR Dramatically demonstrate interference between two identical sources.
	H2-28: FOURIER SYNTHESIZER - ADDITION OF WAVES Demonstrate addition of two sine waves with variable phase difference.
	H2-31: ACOUSTIC COLLIMATOR Demonstrate the effect of frequency on diffraction of sound.
	H2-32: SPEAKER WITH BAFFLE Demonstrates diffraction and interference of sound waves
	H2-33: SPEAKER AND EXPONENTIAL HORN Demonstrate the effect of an exponential horn enclosure.
	H2-41 DOPPLER BALL Demonstrates Doppler effect
	H2-42 DOPPLER EFFECT - TUNING FORK ON STRING Demonstrates Doppler effect
	H2-51 BEATS - AUDIO OSCILLATORS, SPEAKER & OSCILLOSCOPE Hear audio beats and see the wave forms on an oscilloscope
	H2-52: BEATS AND RESONANCE - TUNING BARS To demonstrate beats, and to demonstrate resonance between two identical tuning bar resonators.
	H2-53 BEATS - AUDIO OSCILLATORS AND SPEAKERS Hear beats
	H2-54: BEATS - MOIRE PATTERN MODEL Model for beats between mistuned audio oscillators.
	H2-55: BEATS AND RESONANCE - TUNING BOXES Illustrate beats and resonance.