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--- howto:hambasics:waveinterference [2019/10/05 15:28] – ve7hzf
+++ howto:hambasics:waveinterference [2019/10/05 15:44] – [Wave Addition] ve7hzf
@@ Line 6: / Line 6: @@
 ====== Interference ======
-An important property of waves (radio, sound, water, quantum mechanical!, or otherwise) is that they can interfere with one another.  Here's a //Veritasium// video showing two waves in a pond that interfere with each other.  In some places, the waves add up, in other places, they cancel out.  The section to watch is between 4:33 and 5:17.
+An important property of waves (radio, sound, water, quantum mechanical!, or otherwise) is that they can interfere with one another.  Here's a //Veritasium// video showing how light going through two slits can interfere: In some places, the waves add up, in other places, they cancel out.  Although not directly about radio waves, we saw in the [[intro#electromagnetic_spectrum |intro]] that light and radio waves are in fact on the same electromagnetic spectrum.
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 ====== Wave Addition ======
-Two waves add up together at every point.  Here, the <fc #4682b4>blue</fc> and <fc #008000>green</fc> waves are generated and add up together to form the <fc #ff0000>red</fc> wave.  You can move the blue and green waves and see the result.  To convince yourself that the red wave is really the sum of the blue and green waves, look at points <fc #4682b4>A</fc>, <fc #008000>B</fc>, and <fc #ff0000>C</fc>.  As you move the blue or green wave, you'll see that point <fc #ff0000>C</fc> is always the sum of <fc #4682b4>A</fc> and <fc #008000>B</fc>.
+Two waves add up together at every point.  Here, the <fc #4682b4>blue</fc> and <fc #008000>green</fc> waves are generated and add up together to form the <fc #ff0000>red</fc> wave.  You can move the blue and green waves and see the result.  To convince yourself that the red wave is really the sum of the blue and green waves, look at points <fc #4682b4>A</fc>, <fc #008000>B</fc>, and <fc #ff0000>C</fc>.  You  can move the blue or green waves by sliding their phase (<fc #4682b4>φ</fc> and <fc #008000>Φ</fc>) around.  You'll see that point <fc #ff0000>C</fc> is always the sum of <fc #4682b4>A</fc> and <fc #008000>B</fc>.
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