In this view, light does not have a speed (or the speed is infinite) and it doesn't even have a separate existence from the light source light just is. Aristotle thought that light was an inherent property of fire and other luminous substances. The other wave phenomena that people can sense directly is light. (The top graph shows each sound wave separately the bottom graph shows the result after they are combined algebraically.) Ground" on the other, and slowly moves from constructive interference to destructive and back again. Because they have slightly different frequencies (and therefore slightly different wavelengths) one of the waves gradually "gains This phenomena occurs when two waves of identical shape and amplitude, but slightly different frequency, interfere. I also demonstrated two tuning forks which produced clear and steady tones when played by themselves, but exhibited very strong "beats" (periodic oscillation in the volume) when played together. In other words, I could create destructive interference and show how the volume of the shriek drops noticeably. By changing the length of one of the tubes, I could delay the sound wave traveling through that tube just enough so that it arrived about one-half wavelength behind the wave in the other tube. In class, I demonstrated a "trombone" in which a quite annoying, high-pitched shriek is split and sent through two tubes before being recombined. So, we can have either constructive interference (amplitudes are added) or destructive interference (amplitudes are subtracted). Since the medium propagating the waves can only be at one point, regardless of how many waves are passing that point, the amplitudes of the waves must be combined algebraically. Interference occurs when two waves of very similar frequency and amplitude occupy the same physical space. Phyx 103-0, Light & Sound Light and Sound
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