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Media Files<html> <table border="0" cellpadding="4" width="600"> <tr bgcolor="FFFFCC"> <th align="right"> <br> <font color="999999">Band</font><br> </th> <th align="right" bgcolor="FFFF99"><font size="4"><u>Frequency</u></font></th> <th align="left" bgcolor="FFFF99"><font size="4"><u>Wavelength</u></font></th> <th align="left"> <font color="999999">Example</font></th> <th align="left"> <font color="999999">Attenuation</font></th> <tr bgcolor="CCFFCC"> <td align="right"> </td> <td align="right" bgcolor="99FF99"><b>3 kHz</b><br>3x10<sup>3</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>100 km</b><br> 100x10<sup>3</sup> m</td> <td align="left"><font color="666666">Los Angeles</font></td> <td align="left"><font color="666666"> </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> <font color="666666">Long-wave radio</font> </td> <td align="right" bgcolor="99FF99"><b>30 kHz</b><br> 30x10<sup>3</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>10 km</b><br> 10x10<sup>3</sup> m</td> <td align="left"><font color="666666">Pasadena</font></td> <td align="left" > <font color="666666"> Ionosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> <font color="666666">AM radio </font></td> <td align="right" bgcolor="99FF99"> <b>300 kHz</b><br> 300x10<sup>3</sup> Hz</td> <td align="left" bgcolor="99FF99"> <b>1 km</b><br> 1x10<sup>3</sup> m</td> <td align="left"><font color="666666">JPL</font></td> <td align="left"> <font color="666666"> Ionosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> <font color="666666"> Short-wave radio </font></td> <td align="right" bgcolor="FFFF99"> <b>3 MHz</b><br> 3x10<sup>6</sup> Hz</td> <td align="left" bgcolor="FFFF99"> <b>100 m</b><br> </td> <td align="left"> <font color="666666">Football field</font> </td> <td align="left"> <font color="666666"> Ionosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> <font color="666666"> VHF radio (FM), TV </font></td> <td align="right" bgcolor="FFFF99"> <b>30 MHz</b><br> 30x10<sup>6</sup> Hz</td> <td align="left" bgcolor="FFFF99"> <b>10 m</b><br> </td> <td align="left"> </td> <td align="left"> <font color="666666"> Ionosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> <font color="666666"> UHF radio, TV </td> <td align="right" bgcolor=FFFF99> <b>300 MHz</b><br> 300x10<sup>6</sup> Hz</td> <td align="left" bgcolor=FFFF99 > <b>1 m</b><br> </td> <td align="left" > <font color="666666">Human child</font> </td> <td align="left"> <font color="666666"> </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> <font color="666666"> Microwave radio </font></td> <td align="right" bgcolor="99FF99"> <b>3 GHz</b><br>3x10<sup>9</sup> Hz</td> <td align="left" bgcolor="99FF99"> <b>100 mm</b><br> 100x10<sup>-3</sup> m</td> <td align="left"> </td> <td align="left" > <font color="666666"> </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> <font color="666666"> Microwave radio </font></td> <td align="right" bgcolor="99FF99"> <b>30 GHz</b><br> 30x10<sup>9</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>10 mm</b><br> 10x10<sup>-3</sup> m</td> <td align="left"> </td> <td align="left" > <font color="666666"> Atmosphere opaque<br> except some wavelengths </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> </td> <td align="right" bgcolor="99FF99"><b>300 GHz</b><br> 300x10<sup>9</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>1 mm</b><br> 1x10<sup>-3</sup> m</td> <td align="left"><font color="666666">Grain of sand</font> </td> <td align="left" > <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right" rowspan="5" valign="middle"> <br><br><br> <font color="666666">Infrared light<br><br><br> <font size="2">3,000 - 10,000</font> Å <br> Visible light <br><br><br> Ultraviolet light </font> </td> <td align="right" bgcolor="FFFF99"><b>3 THz</b><br> 3x10<sup>12</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>100 µ</b><br> 100x10<sup>-6</sup> m</td> <td align="left"> </td> <td align="left"> <font color="666666"> Atmosphere opaque<br> except some wavelengths </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right" bgcolor="FFFF99"><b>30 THz</b><br> 30x10<sup>12</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>10 µ</b><br> 10x10<sup>-6</sup> m</td> <td align="left"> <font color="666666">Bacterium</font> </td> <td align="left"> <font color="666666"> Atmosphere opaque<br> except some wavelengths </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right" bgcolor="FFFF99"><b>300 THz</b><br> 300x10<sup>12</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>1 µ</b><br> 1x10<sup>-6</sup> m</td> <td align="left" bgcolor="CCFFCC" rowspan="2" valign="bottom"> <font color="666666"> <font size="1"> RED = 564nm<br> BLUE = 420nm<br><br> </font> </font> </td> <td align="left"> <font color="666666">Atmosphere opaque<br> except some wavelengths </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right" bgcolor="99FF99"><b>3 PHz</b><br> 3x10<sup>15</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>100 nm</b><br> 100x10<sup>-9</sup> m<br> <font color="FF0000"> <font size="2"> 1,000</font> Å </font> </td> <td align="left" valign="top"><font color="666666"> Visible light window </font> </td> </tr> <tr bgcolor="CCFFCC"> <td align="right" bgcolor="99FF99"><b>30 PHz</b><br> 30x10<sup>15</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>10 nm</b><br> 10x10<sup>-9</sup> m</td> <td align="left"> <font color="666666">Virus</font> </td> <td align="left"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> </td> <td align="right" bgcolor="99FF99"><b>300 PHz</b><br> 300x10<sup>15</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>1 nm</b><br> 1x10<sup>-9</sup> m</td> <td align="left"> </td> <td align="left" > <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> </td> <td align="right" bgcolor="FFFF99"><b>3 EHz</b><br> 3x10<sup>18</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>100 pm</b><br> 100x10<sup>-12</sup> m</td> <td align="left"> <font color="666666">Atom</font> </td> <td align="left"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right" bgcolor="FFFFCC"> <font color="666666"> X-rays </font></td> <td align="right" bgcolor="FFFF99"><b>30 EHz</b><br> 30x10<sup>18</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>10 pm</b><br> 10x10<sup>-12</sup> m</td> <td align="left" bgcolor="FFFFCC"> </td> <td align="left" bgcolor="FFFFCC"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> </td> <td align="right" bgcolor="FFFF99"><b>300 EHz</b><br> 300x10<sup>18</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>1 pm</b><br> 1x10<sup>-12</sup> m</td> <td align="left"> </td> <td align="left"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> <font color="666666"> Gamma rays </font></td> <td align="right" bgcolor="99FF99"><b>ZHz</b><br>3x10<sup>21</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>100 fm </b><br> 100x10<sup>-15</sup> m</td> <td align="left"> </td> <td align="left" > <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> </td> <td align="right" bgcolor="99FF99"><b>ZHz</b><br>30x10<sup>21</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>10 fm </b><br> 10x10<sup>-15</sup> m</b></td> <td align="left"> </td> <td align="left" > <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td align="right"> </td> <td align="right" bgcolor="99FF99"><b>ZHz</b><br>300x10<sup>21</sup> Hz</td> <td align="left" bgcolor="99FF99"><b>1 fm </b><br> 1x10<sup>-15</sup> m</td> <td align="left"> <font color="666666">Atomic nucleus</font> </td> <td align="left" > <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> </td> <td align="right" bgcolor="FFFF99"><b>YHz</b><br>3x10<sup>24</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>100 am </b><br> 100x10<sup>-18</sup> m</td> <td align="left"> </td> <td align="left"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> </td> <td align="right" bgcolor="FFFF99"><b>YHz</b><br>30x10<sup>24</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>10 am </b><br> 10x10<sup>-18</sup> m</td> <td align="left"> </td> <td align="left"> <font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="FFFFCC"> <td align="right"> </td> <td align="right" bgcolor="FFFF99"><b>YHz</b><br>300x10<sup>24</sup> Hz</td> <td align="left" bgcolor="FFFF99"><b>1 am </b><br> 1x10<sup>-18</sup> m</td> <td align="left"> </td> <td align="left"><font color="666666"> Atmosphere opaque </font></td> </tr> <tr bgcolor="CCFFCC"> <td colspan="5"> <font size="2"> <u>Excerpts from Glossary</u>: THz=TeraHertz PHz=PetaHertz EHz=ExaHertz ZHz=ZettaHertz YHz=YottaHertz µ=micrometer, micron nm=nanometer pm=picometer fm-femtometer am=attometer Angstrom,<font size="3"> Å</font>, is 0.1 nm. Angsrtoms have traditionally been used to describe wavelengths of light. The nanometer is generally preferred today. </font> </td> </tr> </table> <hr /> <table border=0> <tr> <td valign="top"><b>Region</b></td> <td valign="top"><b>Approx Range (meters/hertz) </b></td> <td valign="top"><b>Specific Range</b></td> </tr> <tr> <td align="center" valign="top" rowspan="15">Radio Waves <br> <td valign="top">10<sup>4</sup> - 10<sup>-2</sup> m/10<sup>4</sup> - 10<sup>10</sup> Hz</td> <td valign="top"> </td> </tr> <tr> <td>ultra-low frequency (ULF)</td> <td>3 - 30 Hz</td> </tr> <tr> <td>extremely low frequency (ELF)</td> <td>30 - 300 Hz</td> </tr> <tr> <td>voice frequencies (VF)</td> <td>300 Hz - 3 kHz</td> </tr> <tr> <td valign="top">very low frequency (VLF)</td> <td valign="top">3 - 30 kHz</td> </tr> <tr> <td valign="top">low frequency (LF)</td> <td valign="top">30 - 300 kHz</td> </tr> <tr> <td valign="top">medium frequency (MF)</td> <td valign="top">300 kHz - 3 MHz</td> </tr> <tr> <td valign="top">high frequency (HF)</td> <td valign="top">3 - 30 MHz</td> </tr> <tr> <td valign="top">very high frequency (VHF)</td> <td valign="top">30 - 300 MHz</td> </tr> <tr> <td valign="top">ultra high frequency (UHF)</td> <td valign="top">300 MHz - 3 GHz</td> </tr> <tr> <td valign="top">super high frequency (SHF)</td> <td valign="top">3 - 30 GHz</td> </tr> <tr> <td>extremely high frequency (EHF)</td> <td>30 - 300 GHz</td> </tr> <tr> <td valign="top">shortwave</td> <td valign="top">see MF, HF</td> </tr> <tr> <td valign="top">television</td> <td valign="top">see VHF, UHF</td> </tr> <tr> <td valign="top">microwave</td> <td valign="top">30 cm - 1 mm/1-300 GHz </td> </tr> <tr> <td align="center" valign="top" rowspan="4">Infrared <br> <td valign="top">10<sup>-3</sup> - 10<sup>-6</sup> m/10<sup>11</sup> - 10<sup>14</sup> Hz</td> <td valign="top"> </td> </tr> <tr> <td valign="top">far</td> <td valign="top">1000-30 um</td> </tr> <tr> <td valign="top">middle</td> <td valign="top">30-3 um</td> </tr> <tr> <td valign="top">near</td> <td valign="top">3-0.75 um</td> </tr> <tr> <td align="center" valign="top" rowspan="7">Visible <br> <td valign="top">5x10<sup>-7</sup> m/2x10<sup>14</sup> Hz</td> <td valign="top"> </td> </tr> <tr> <td valign="top" bgcolor="#FF0000">red</td> <td valign="top">770-622 nm</td> </tr> <tr> <td valign="top" bgcolor="#FF8000">orange</td> <td valign="top">622-597 nm</td> </tr> <tr> <td valign="top" bgcolor="#FFFF00">yellow</td> <td valign="top">597-577 nm</td> </tr> <tr> <td valign="top" bgcolor="#00FF00">green</td> <td valign="top">577-492 nm</td> </tr> <tr> <td valign="top" bgcolor="#0000FF"><font color="#FFFFFF">blue</font></td> <td valign="top">492-455 nm</td> </tr> <tr> <td valign="top" bgcolor="#800080"><font color="#FFFFFF">violet</font></td> <td valign="top">455-390 nm</td> </tr> <tr> <td align="center" valign="top" rowspan="7">Ultraviolet <br> <td valign="top">10<sup>-7</sup> - 10<sup>-8</sup> m/10<sup>15</sup> - 10<sup>16</sup> Hz</td> <td valign="top"> </td> </tr> <tr> <td valign="top">UV-A (least harmful)</td> <td valign="top">400-315 nm</td> </tr> <tr> <td valign="top">UV-B (more harmful, absorbed by ozone)</td> <td valign="top">315-280 nm</td> </tr> <tr> <td valign="top">UV-C (most harmful, but all absorbed by air)</td> <td valign="top">280-100 nm</td> </tr> <tr> <td valign="top">near UV ("black light")</td> <td valign="top">400-300 nm</td> </tr> <tr> <td valign="top">far UV</td> <td valign="top">300-200 nm</td> </tr> <tr> <td valign="top">vacuum UV</td> <td valign="top">200-100 nm</td> </tr> <tr> <td valign="top">X ray</td> <td valign="top">10<sup>-9</sup> - 10<sup>-11</sup> m/10<sup>17</sup> - 10<sup>19</sup> Hz</td> <td valign="top"> </td> </tr> <tr> <td valign="top">Gamma ray</td> <td valign="top">10<sup>-11</sup> - 10<sup>-13</sup> m/10<sup>19</sup> - 10<sup>21</sup> Hz</td> <td valign="top"> </td> </tr> </table> </html> ==== spectrum allocation ==== � as relates to nasa > http://classwww.gsfc.nasa.gov/gsams/organization.htm � internaiton spectrum managment > http://www.itu.int/ see also [[Natural Radio]] \\ [[VanEck]] Please fill all the letters into the box to prove you're human. Please keep this field empty: SavePreviewCancel Edit summary Note: By editing this page you agree to license your content under the following license: CC Attribution-Share Alike 4.0 International electromagnetic_spectrum.1181400305.txt.gz Last modified: 2007-06-09 14:45by nik