wave_motion.gif (10915 bytes)

INTERFERENCE OF TWO LOUDSPEAKERS








EQUIPMENT
    redball.gif (326 bytes) Speakers
    redball.gif (326 bytes) Stereo
    redball.gif (326 bytes) Oscillator
    redball.gif (326 bytes) Oscilloscope and Microphone
    redball.gif (326 bytes) Video Projector or Large Monitor



NARRATIVE
            Two loudspeakers producing the same tone placed a certain distance apart act as a double slit Young's Experiment for electromagnetic waves. The two speakers are hooked up through the stereo amplifier and placed at different ends of the lecture table. An audio oscillator is then connected to the amplifier and the students can hear the interference by moving their heads from side to side. Additionally, you can hook up the oscilloscope with the microphone and by moving the microphone from one speaker to the other, they can see the interference projected by the video projector.