The Naked Scientists

The Naked Scientists Forum

Author Topic: Discuss: Did I see 3 Rainbows?  (Read 1724 times)

Offline thedoc

  • Forum Admin
  • Administrator
  • Sr. Member
  • *****
  • Posts: 511
  • Thanked: 12 times
    • View Profile
Discuss: Did I see 3 Rainbows?
« on: 28/04/2013 00:28:52 »
Does holding a car remote to your head make it work better? Why does a boat float? Are triple rainbows real? What's a near-death experience? This week we also look at a new scientific study into why - and when - breast milk transmits HIV to a baby...
Listen to this Show

or  

If you want to discuss this show, or ask a question, this is the place to do it.
« Last Edit: 28/04/2013 00:28:52 by _system »


 

Offline syhprum

  • Neilep Level Member
  • ******
  • Posts: 3818
  • Thanked: 19 times
    • View Profile
Re: Discuss: Did I see 3 Rainbows?
« Reply #1 on: 28/04/2013 19:52:10 »
Triple rainbows do exist in theory but generally they are too dim to see without image enhancement
 

Offline David Cooper

  • Neilep Level Member
  • ******
  • Posts: 1505
    • View Profile
Re: Discuss: Did I see 3 Rainbows?
« Reply #2 on: 28/04/2013 19:56:35 »
The weather conditions in Aberdeen frequently produce triple rainbows which are very clear to the eye, though I don't think I've ever seen three full arcs - usually it's just the lower ends of one side of a rainbow against thudding black cloud. It came as a big surprise to me to hear that science was questioning their existence. I don't think I've never seen a quadruple one though.
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8126
  • Thanked: 53 times
    • View Profile
Re: Discuss: Did I see 3 Rainbows?
« Reply #3 on: 28/04/2013 20:09:46 »
Quote from: the Doc
Does holding a car remote to your head make it work better?

The radio remote at temple increasing range has been discussed before : you are a better antenna for the transmitter if you hold the the remote control near your head  ...

Quote
When a transmitter is connected to an antenna by a feed line, the impedance of the antenna and feed line must match exactly for maximum energy transfer from the feed line to the antenna to be possible. The impedance of the antenna varies based on many factors including: the antenna's natural resonance at the frequency being transmitted, the antenna's height above the ground
http://en.wikipedia.org/wiki/Standing_wave_ratio#Practical_implications_of_SWR
« Last Edit: 28/04/2013 20:39:35 by RD »
 

The Naked Scientists Forum

Re: Discuss: Did I see 3 Rainbows?
« Reply #3 on: 28/04/2013 20:09:46 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums