The Propagation Of Electromagnetic Waves

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If someone could explain about the propagation of electromagnetic waves to me, that would be really great.

― Alex in Doncaster (Alex in Doncaster), Thursday, 11 December 2003 22:26 (twenty-two years ago)

same here re: 'how babies are made'

― mark p (Mark P), Thursday, 11 December 2003 22:28 (twenty-two years ago)

Specifically radio waves. And maybe radiobabies.

― Alex in Doncaster (Alex in Doncaster), Thursday, 11 December 2003 22:29 (twenty-two years ago)

This is how my parents explained it to me:

http://www.dh.org/web-images/medical/ultrasound.gif

― may pang (maypang), Thursday, 11 December 2003 22:31 (twenty-two years ago)

http://www.physics.sfsu.edu/~rrogers/Phys%20321/Image28.gif

― mark s (mark s), Thursday, 11 December 2003 22:41 (twenty-two years ago)

I am glad that Mark P is posting more these days.

― Casuistry (Chris P), Thursday, 11 December 2003 23:19 (twenty-two years ago)

http://www.aquariusrecords.org/images/eldacroscd.jpg

― Rockist Scientist (rockistscientist), Thursday, 11 December 2003 23:54 (twenty-two years ago)

different question (sorry): i was reading about how they managed to slow down light today (without losing energy, or something) and i didn't understand. i thought the speed thereof was, like, a constant or something ... but indeed i'm no rocket scientist

― brian nemtusak (sanlazaro), Friday, 12 December 2003 00:53 (twenty-two years ago)

C is the speed of light in a vacuum.

― adam (adam), Friday, 12 December 2003 01:42 (twenty-two years ago)

The ways radio waves propagate are extremely dependent on the frequency/wavelength of the waves themselves. Some waves can be bounced off the troposphere and go extremely long distances while others are only good for line-of-sight. The coolest are the VLF waves that propagate through the earth. That's what the Navy uses to communicate with submarines, they have big long snake antennas hanging out the back of the Tridents to communicate with massive shore stations.

http://electronics.howstuffworks.com/radio-spectrum.htm

― TOMBOT, Friday, 12 December 2003 01:48 (twenty-two years ago)

but like they slowed it down and didn't lose energy or something

― brian nemtusak (sanlazaro), Friday, 12 December 2003 05:39 (twenty-two years ago)

i should've paid closer attention

― brian nemtusak (sanlazaro), Friday, 12 December 2003 05:40 (twenty-two years ago)

They fed the light donuts and the subsequent sugar-rush ensured that energy levels remained high but the paunch prevented it from moving as quickly or looking quite as snakehipped and HAWT as previous

― Alex in Doncaster (Alex in Doncaster), Friday, 12 December 2003 05:48 (twenty-two years ago)

― jackson anderville, Friday, 12 December 2003 06:32 (twenty-two years ago)

HSA to thread. Honestly. Sometimes I wish he posted here, so he could bang on about radiowaves and electromagnetic waves and how much he loves the National Grid all day long. I would like that. Then there would be more threads like this.

― HRH Queen Kate (kate), Friday, 12 December 2003 09:10 (twenty-two years ago)

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