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In Reply to: "Light" is the visible part of the electromagnetic spectrum posted by Bill Z on August 29, 2001 at 06:44:31:
Go back to school and get your point. Both UV and infrared ARE light, though for us humans they are not visible to us. Just because we can't see them doesn't mean they aren't light (they're just not "visible" light). Infra (below) red is just below our sight threshold and ultra (beyond) violet is just above our sight threshold. Many teachers, even when they know better, will follow what a textbook says just to get through the class. I've seen it in high school and college. Some even admit it! Maybe this is what your teacher was doing. Think about how we classify sound. Human hearing is nearly always listed as 20Hz-20kHz. Soundwaves below 20Hz are called infrasonic: those above 20kHz are called ultrasonic. If someone could hear a 23kHz tone, would we say they are hearing "inaudible" sound (to use your "invisible" suggestion)? Of course not. We'd say they were crazy (HA HA). Of course, physicists are strange sometimes. They are much like the French -- they try to be difficult to get on your nerves. All of this because I asked a question about filters. Please accept my sincere apologies. Now back to something to soothe and calm... the Audio Asylum. HAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA!!!!!!!!!!!
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