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PART 5
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The discovery of EM fields led to the wireless radio and ultimately to the sophisticated and complex variety of communications systems we know today Radio waves are not the only form of EM radiation As the frequency increases above that of conventional radio, we encounter new forms First come the microwaves Then comes infrared (IR), or heat rays After that comes visible light, ultraviolet (UV) radiation, x-ray energy, and gamma-ray energy In the opposite, and less commonly imagined, sense, EM fields can exist at frequencies far below those of radio signals Some extremely-low-frequency (ELF) fields have frequencies less than the 50 or 60 Hz of ac utility electricity In theory, an EM wave can go through one complete cycle every hour, day, year, thousand years, or million years Some astronomers suspect that stars and galaxies generate EM fields with periods of years, centuries, or millennia
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The wavelengths of the lowest-frequency EM fields can extend, at least theoretically, for light-years The shortest gamma rays have, as we have already mentioned, wavelengths that measure only a tiny fraction of a nanometer In between these extremes lie all the forms of EM energy
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THE EM WAVELENGTH SCALE
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To illustrate the range of EM wavelengths, scientists often use a logarithmic scale It is necessary to use a logarithmic scale because the range is so great that a linear scale is impractical The left-hand portion of Fig 18-2 is such a logarithmic scale and shows wavelengths from 108 down to 10 12 m Each division, in the direction of shorter wavelength, represents a tenfold decrease, known as a mathematical order of magnitude (not to be confused with star magnitude) Utility ac is near the top of this scale; the wavelength of 60-Hz ac in free space is quite long Gamma rays are at the bottom; their EM wavelengths are tiny From this example, it is easy to see that visible light takes up only a tiny sliver of the EM spectrum However, this diagram makes the visible por-
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108 m
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Utility AC
104 m Shortwave radio 1m Microwaves Red 800 nm 700 nm
10-4 m
Green 10-8 m
600 nm 500 nm
Violet 400 nm
X rays Gamma rays
to 10
10-12 m
300 nm
Figure 18-2 The EM spectrum from wavelengths of 108 m down
m, and an exploded view of the visible-light spectrum within
tion of the realm look much larger than it is in linear proportion If the scale were linear in this illustration, the visible slice would be thinner than the diameter of an atom Along the right-hand scale, visible wavelengths are denoted in nanometers
HOW LITTLE WE SEE!
The next time you get a chance, look through a red or blue colored piece of glass or cellophane Such a color filter greatly restricts the view you get of the world because only a narrow range of visible wavelengths can pass through it Different colors cannot be ascertained through the filter For
PART 5
Space Observation and Travel
example, when a scene is viewed through a red filter, blue appears the same as black, and crimson appears the same as gray or white Other colors look red with varying degrees of saturation, but there is little or no variation in the hue If our eyes had built-in red color filters, our view of the world would be much different; we would essentially be color-blind When considered with respect to the entire EM spectrum, all optical instruments suffer from the same sort of handicap we would have if the lenses in our eyeballs were tinted red The range of wavelengths we can detect with our eyes is approximately 770 nm at the longest and 390 nm at the shortest Energy at the longest visible wavelength appears red to our eyes, and energy at the shortest visible wavelength appears violet The intervening wavelengths show up as orange, yellow, green, blue, and indigo In order to see EM energy waves above and below the visible spectrum, we need special apparatus Astronomers have devised an amazing variety of instruments that can detect energy all the way from the radio spectrum through microwaves, IR, visible, UV, x-rays, and even gamma rays
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