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      <title>Regions of the EM Spectrum by Roberto Sacco</title>
      <link>https://padlet.com/sacco/960wb8cozq0z</link>
      <description></description>
      <language>en-us</language>
      <pubDate>2017-12-05 01:52:54 UTC</pubDate>
      <lastBuildDate>2026-01-29 11:28:23 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
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         <title>Gamma ray from Alex and Riekesh</title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213213557</link>
         <description><![CDATA[<div>Gamma rays are penetrating <a href="https://en.m.wikipedia.org/wiki/Electromagnetic_radiation">electromagnetic radiation</a> of a kind arising from the <a href="https://en.m.wikipedia.org/wiki/Radioactive_decay">radioactive decay</a> of <a href="https://en.m.wikipedia.org/wiki/Atomic_nucleus">atomic nuclei</a>. It consists of <a href="https://en.m.wikipedia.org/wiki/Photon">photons</a> in the highest observed range of <a href="https://en.m.wikipedia.org/wiki/Photon_energy">photon energy</a>.The decay of an <a href="https://en.m.wikipedia.org/wiki/Atomic_nucleus">atomic nucleus</a> from a high energy state to a lower energy state, a process called <em>gamma decay</em>, produces gamma radiation.Gamma rays ionize atoms (they are <a href="https://en.m.wikipedia.org/wiki/Ionizing_radiation">ionizing radiation</a>), and are thus biologically hazardous. <br>Wavelength: 10<sup>-16 </sup>to 10<sup>-9</sup>m <br>Frequency: 3x10<sup>24</sup> to 3x10<sup>17</sup> Hz <br>Uses: Cancer treatment, observing universe <br>Danger: Cancer </div>]]></description>
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         <pubDate>2017-12-05 10:31:03 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213213557</guid>
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      <item>
         <title> Visible Light ⚡️✨⭐️ || Jhennell and Camila </title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213213568</link>
         <description><![CDATA[<div>Visible light is the light we can see. <br><br>Frequency: 8x10<sup>14&nbsp; </sup>to 4x10<sup>14&nbsp; &nbsp;</sup>Hz<br>Wavelength: 370nm (Violet) to 740nm (red)<br><br><br>Uses:&nbsp; To see&nbsp; , For light , lets us record videos and take pictures&nbsp;<br><br>&nbsp;<br><br>Dangers: Damage our eyes (produces cataracts) , Indirectly damage our DNA through the generation of reactive oxygen, Can cause photo-degradation of pig,nets and colourants&nbsp;</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:31:05 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213213568</guid>
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      <item>
         <title>Radiowaves</title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213213706</link>
         <description><![CDATA[<div>Naturally occurring radio waves are generated by lightning or by astronomical objects while artificial radio waves are generated by radio transmitters and received by radio receivers, electrical generators, power Iines, and appliances <br><br>It has the longest wavelengths in the EM spectrum which is 1m to 100000m<br>It has the lowest frequencies which is 3x10<sup>9</sup> to 3x10<sup>4</sup><sub><sup> </sup></sub> Hz<br><br>Uses: Telecommunications, TV, Radio, Broadcasting, Navigation systems, Satellites, Computer Networks, Radar<br><br>Dangers: Small radiowaves doesn't cause any dangers. Large doses of radio waves causes cancer and leukaemia.</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:31:31 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213213706</guid>
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      <item>
         <title>Infrared 💢 Alif</title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213213796</link>
         <description><![CDATA[<div><strong>Infrared radiation</strong>, or simply <strong>infrared</strong> or <strong>IR</strong>, is electromagnetic radiation.&nbsp;<br>The wavelength is 740nm to 0.01m&nbsp;<br>Frequency: 4x10</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:31:50 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213213796</guid>
      </item>
      <item>
         <title>Infra-red🔴 </title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213213889</link>
         <description><![CDATA[<div>Wavelength: 740mn to 0.01m<br>Frequency: 4x10<sup>14&nbsp;</sup>&nbsp;to 3x10<sup>17&nbsp;</sup>&nbsp;Hz&nbsp;<br>Uses: heating, cooking , tv remotes&nbsp;<br>Dangers: can burn&nbsp;<br><br>All object give out and take in thermal radiation, which is also called infra-red radiation the hotter an object is, the more infra-red radiation it emits</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:32:09 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213213889</guid>
      </item>
      <item>
         <title>X-Rays 📷</title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213214612</link>
         <description><![CDATA[<div>It's a very effective way of looking at the bones and can be used to help detect a range of conditions.X-rays are usually carried out in hospital X-ray departments by trained specialists called radiographers, although they can also be done by other healthcare professionals, such as dentists.</div><div>X-rays are a type of radiation that can pass through the body. They can't be seen by the naked eye and you can't feel them. As they pass through the body, the energy from X-rays is absorbed at different rates by different parts of the body. A detector on the other side of the body picks up the X-rays after they've passed through and turns them into an image.</div><div><br>Wavelength: 10<sup>-12 </sup>to 10<sup>-7 </sup>m<br>Frequency: 3x10<sup>20 </sup>to 3x10<sup>15 </sup>Hz<br>Uses: Medical imagery, security, bone fractures and breaks, tooth problems, such as loose teeth and <a href="https://www.nhs.uk/conditions/Dental-abscess/Pages/Introduction.aspx">dental abscesses</a>, <a href="https://www.nhs.uk/conditions/Scoliosis/Pages/Introduction.aspx">scoliosis</a> (abnormal curvature of the spine), non-cancerous and <a href="https://www.nhs.uk/conditions/Cancer-of-the-bone/Pages/Introduction.aspx">cancerous bone tumours</a>, lung problems, such as <a href="https://www.nhs.uk/conditions/Pneumonia/Pages/Introduction.aspx">pneumonia</a> and lung cancer,<a href="https://www.nhs.uk/conditions/Dysphagia/Pages/definition.aspx">dysphagia</a> swallowing problems) , heart problems, such as heart failure, breast cancer</div><div>Dangers: Cancer, Causes headaches, makes you sick</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:34:47 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213214612</guid>
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      <item>
         <title>Microwaves 🔥</title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213214978</link>
         <description><![CDATA[<div><strong>Wavelength: 0.001m to 1m.H<br>Frequency: 3x10</strong><strong><sup>12 </sup></strong><strong>&nbsp;to 3x10</strong><strong><sup>9 </sup></strong><strong>Hz.<br></strong>Microwaves cause water and fat molecules to vibrate, which makes the substances hot.</div><div>So we can use microwaves to <strong>cook</strong> many types of food.</div><div><strong>Mobile phones</strong> use microwaves, as they can be generated by a small antenna, which means that the phone doesn't need to be very big. <strong>Wifi</strong> also uses microwaves.</div><div>The drawback is that, being small, mobiles phones can't put out much power, and they also need a line of sight to the transmitter.<br><br></div><ul><li>Medicine:</li></ul><blockquote>In some cases microwaves can be used to treat health problems better than drugs.&nbsp; Microwaves are primarily used in medical cases as an alternative to surgery.&nbsp; For example an enlarged prostate.&nbsp; Instead of surgically removing the problematic organ, doctors can use microwaves to heat op the enlarging tissue of the prostate and in turn decreasing the size of the enlarged prostate.</blockquote><ul><li>Industry:&nbsp;</li></ul><blockquote>Microwaves in this field are primarily used for clean up.&nbsp; They can be used to decrease air pollutants, sanitize hospital waste, enhance dry cleaning solvents, and clean up polluted soil.</blockquote><ul><li>Science:</li></ul><blockquote>Scientists use microwaves to make a special conductor made of copper called chalcopyrite.&nbsp; Microwaves can add in the process of separating chemical compounds, thus allowing scientist to individually study each component of the compound.</blockquote><ul><li>Communication:</li></ul><blockquote>Microwaves are also in cellular phones, telephones, telegraphs, television, and satellites.&nbsp; They are useful in communication because they easily penetrate the earth's atmosphere.&nbsp; This comes in handy primarily for space-vehicle communication.<br><br></blockquote>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:36:03 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213214978</guid>
      </item>
      <item>
         <title>Ultraviolet </title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213215211</link>
         <description><![CDATA[<div>What is ultraviolet? It is electromagnetic radiation having a&nbsp;<br>Wavelength shorter then that of the violet.<br>Uses: discos, tanning salons, counterfeit detections, pollination.<br>Dangers: Skin cancer&nbsp;<br>Ultraviolet radiation is found naturally in sunlight. </div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:37:01 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213215211</guid>
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      <item>
         <title></title>
         <author></author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213215219</link>
         <description><![CDATA[<div>Samina and zainab&nbsp;<br>X-rays<br>X-ray is an electromagnetic spectrum ray with very high frequency <br>Dangers : too much radiation exposure causes cell mutation which may lead to cancer.<br>Causes damage to DNA<br>Kills healthy cells when used to kill cancerous cells<br><br><br>Uses: used in medicine&nbsp;<br>Imaging the human body&nbsp;<br>Used to kill cancer cells&nbsp;<br>Used in big industries and in airports to check customers luggage&nbsp;<br>Used by art historians to see if a picture has been painted on top of an older one<br><br><br></div>]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:37:04 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213215219</guid>
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      <item>
         <title></title>
         <author>dhali_alif</author>
         <link>https://padlet.com/sacco/960wb8cozq0z/wish/213217062</link>
         <description><![CDATA[]]></description>
         <enclosure url="" />
         <pubDate>2017-12-05 10:43:57 UTC</pubDate>
         <guid>https://padlet.com/sacco/960wb8cozq0z/wish/213217062</guid>
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