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Electromagnetic spectrum - how do you remember it?

Discussion in 'Science' started by rachel_g41, Apr 10, 2007.

  1. averagedan

    averagedan Occasional commenter

  2. kthor11083

    kthor11083 New commenter


    It’s how I was taught it 10 years ago, and how I teach it today ☺️
  3. dunnocks

    dunnocks Star commenter

    I have never heard of using a nmemonic for this, and this is exactly why, it is n't a definitive list with clear classifictations
  4. uxleumas

    uxleumas New commenter

    grandma's eXalent unibrow violates iowa's marrage restrictions
  5. blazer

    blazer Star commenter

  6. Orion

    Orion New commenter

    Please! All this is wasting memory cells......

    Just work on the principle.... ROY - G - BIV

    Then you add to it..... by logical reasoning

    IR -> ROY - G - BIV -> UV

    Then you work on the idea that micro are longer and even longer still are radio to curve around the planet so must be added on to the red side as are ok for you, but UV is clearly not!

    Radio -> Micro -> IR -> ROY - G - BIV -> UV

    Finally talk about what is great to look inside your body but not turn you into a hulk....

    UV -> X-Rays ->


    -> Gamma!

    This is a great logical way to treat the spectrum.

    Also for Triple pupils I would always add in that X-Rays can be hard or soft due to how you create them with bombardment of metal with electrons. Hence, you get an overlap!

    However, gamma is from a rad source and fixed!
  7. Shedman

    Shedman Star commenter

    I spent 30+ years teaching the dispersion of light with prisms and diffraction gratings but I could never with any certainty identify where the Indigo was.
    rachel_g41 likes this.
  8. rachel_g41

    rachel_g41 Established commenter

    I've read somewhere that Newton identified six colours and added indigo to make seven, because 7 was a lucky number or something to do with the occult. Seriously.
    Shedman likes this.
  9. Shedman

    Shedman Star commenter

    Yes, I have read that story as well. 7 was indeed considered a special number - seven seas, seven day of week, seven nail holes in a horseshoe, seventh son of a seventh son etc. So as God created light from other colours there must be seven of them so he stuck in Indigo between blue and purple but is it actually a separate colour? I don't think so but what do I know.
  10. chenphili

    chenphili New commenter

    Hi, just want to know whether cathode ray tube still in the IGCSE physics syllabus?
  11. rachel_g41

    rachel_g41 Established commenter

    I don't think it's specifically mentioned any more - at least in CIE - but particles in fields is required and that's a good place to cover the CRT.
  12. chenphili

    chenphili New commenter

    Thanks, but particle fields is not in IGCSE syllabus.
  13. rachel_g41

    rachel_g41 Established commenter

    Sorry, I assumed you meant the 0625 Physics - particles in fields comes in there in EM effects and Radioactivity.
  14. chenphili

    chenphili New commenter

    Oh yes, you're right. You meant the alpha, beta particles. Thank you.
    Yes, 0625 physics.

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