2007-01-21 07:09:27 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Light is electromagnetic radiation (EMR). When we talk about light in normal conversation we are talking about EMR that people can perceive. This is in the wavelength range of approximately 400 - 700 nm. Other organisms can see in a different range. The ability to perceive ultra-violet light is common in insects and birds. Other types of EMR are x-rays, gamma-rays, radio waves, microwaves, etc.
Light (like all EMR) is divided into discrete units (quanta) called photons. Sometimes photons are like particles and sometimes they are like waves; but that gets into quantum mechanics. The speed of light is approximately 186,000 miles a second (or a little less than 300,000,000 meters per second) in a vacuum. Nothing can go faster than the speed of light.
2007-01-21 08:25:23 · answer #1 · answered by sessich 2 · 0⤊ 0⤋
Light is opposite of heavy
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2007-01-21 15:17:00 · answer #2 · answered by Scythian1950 7 · 0⤊ 0⤋
Photons
2007-01-21 15:16:39 · answer #3 · answered by skwonripken 6 · 0⤊ 0⤋
good question. Physics doesn't usually deal in "whats" or "whys", but only "hows"
2007-01-21 16:02:23 · answer #4 · answered by walter_b_marvin 5 · 0⤊ 0⤋
opposite of dark but you can see where your going
2007-01-21 15:17:26 · answer #5 · answered by lisa s 2 · 0⤊ 0⤋