Groups > sci.physics.relativity > #454103

A GOOD QUESTION

Newsgroups	sci.physics.relativity
From	Keith Stein <keithstein111@gmail.com>
Subject	A GOOD QUESTION
Message-ID	<NtQuC.340490$_J4.75944@fx28.am4> (permalink)
Organization	virginmedia.com
Date	2018-03-28 18:42 +0100

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When light slows down by entering a more dense medium such as glass, or
water, the frequency stays the same and the WAVELENGTH REDUCES.

So how is it that when light slows down traveling across intergalactic 
space,the the WAVELENGTH INCREASES ?

good question!

when light slows down entering a more dense medium, the front of the 
wave train hits the more dense medium first. The front therefore slows 
before the rear of the wave train, resulting in the rear of the wave 
catching up to some extent with the front. Thus the wave train 
compresses and the WAVELENGTH REDUCES.

When light slows down in intergalactic space, on the other hand, there 
is no difference in the conditions at the front or back of the wave 
train. At any one time the front and back are indeed traveling at the 
same speed, and therefore the length of the wave train stays constant as 
it travels through intergalactic space.

So "How is it that the wavelength of light from distant galaxies is 
INCREASED ? " you might ask, and i would reply that it is NOT that light 
is stretched as it travels through intergalactic space, but rather that 
it was emitted with an increased wavelength, when the velocity of light 
was higher than it is now.

The frequency generated by any given atomic transition, even on distant 
galaxies many billions of years ago, is exactly the same as that on 
Earth today. The wavelength is proportional the the velocity of light AT 
THE TIME IT WAS EMITTED, and This increased wavelength is faithfully 
transmitted through space, where it is measured in our observatories.

keith stein

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A GOOD QUESTION Keith Stein <keithstein111@gmail.com> - 2018-03-28 18:42 +0100
  A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-03-28 10:50 -0700
    Re: A GOOD QUESTION Keith Stein <keithstein111@gmail.com> - 2018-03-28 19:07 +0100
  A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-03-28 11:23 -0700
  Re: A GOOD QUESTION Edward Prochak <edprochak@gmail.com> - 2018-03-28 12:25 -0700
  A GOOD QUESTION Steve BH <sbharris@gmail.com> - 2018-03-28 12:27 -0700
    A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-03-28 12:52 -0700
      A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-03-28 12:57 -0700
    Re: A GOOD QUESTION Koobee Wublee <koobee.wublee@gmail.com> - 2018-03-28 13:45 -0700
      Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-03-28 14:39 -0700
    Re: A GOOD QUESTION RichD <r_delaney2001@yahoo.com> - 2018-04-20 16:44 -0700
      Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 17:13 -0700
        Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 17:21 -0700
      Re: A GOOD QUESTION Lofty Goat <rlwatkins@gmail.com> - 2018-04-20 20:00 -0500
        Re: A GOOD QUESTION RichD <r_delaney2001@yahoo.com> - 2018-04-21 12:32 -0700
          Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-21 12:41 -0700
          Re: A GOOD QUESTION Tom Roberts <tjroberts137@sbcglobal.net> - 2018-04-21 19:28 -0500
            Re: A GOOD QUESTION mlwozniak@wp.pl - 2018-04-21 21:49 -0700
              Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-23 08:14 +1000
                Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-22 16:40 -0700
                Re: A GOOD QUESTION Python <python@python.invalid> - 2018-04-23 01:53 +0200
                Re: A GOOD QUESTION Edward Prochak <edprochak@gmail.com> - 2018-04-24 09:45 -0700
            Re: A GOOD QUESTION Erálnì Histickému <no@ovmwk.gn> - 2018-04-22 08:06 +0000
            Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-23 08:12 +1000
          Re: A GOOD QUESTION Lofty Goat <rlwatkins@gmail.com> - 2018-04-21 19:38 -0500
            Re: A GOOD QUESTION Tom Roberts <tjroberts137@sbcglobal.net> - 2018-04-22 09:04 -0500
              Re: A GOOD QUESTION Erálnì Histickému <no@ovmwk.gn> - 2018-04-22 14:55 +0000
              Re: A GOOD QUESTION Lofty Goat <rlwatkins@gmail.com> - 2018-04-22 12:03 -0500
                Re: A GOOD QUESTION Erálnì Histickému <no@ovmwk.gn> - 2018-04-23 16:29 +0000
    Re: A GOOD QUESTION kenseto <setoken@att.net> - 2018-05-13 08:15 -0700
      Re: A GOOD QUESTION Odd Bodkin <bodkinodd@gmail.com> - 2018-05-13 18:47 +0000
        Re: A GOOD QUESTION kenseto <setoken@att.net> - 2018-05-14 07:56 -0700
          Re: A GOOD QUESTION Odd Bodkin <bodkinodd@gmail.com> - 2018-05-14 16:47 +0000
            Re: A GOOD QUESTION kenseto <setoken@att.net> - 2018-05-14 14:59 -0700
              Re: A GOOD QUESTION Odd Bodkin <bodkinodd@gmail.com> - 2018-05-14 22:24 +0000
        Re: A GOOD QUESTION RichD <r_delaney2001@yahoo.com> - 2018-05-16 10:35 -0700
          Re: A GOOD QUESTION Odd Bodkin <bodkinodd@gmail.com> - 2018-05-16 18:32 +0000
          Re: A GOOD QUESTION Tom Roberts <tjroberts137@sbcglobal.net> - 2018-05-16 18:52 -0500
    Re: A GOOD QUESTION kenseto <setoken@att.net> - 2018-05-17 10:01 -0700
      Re: A GOOD QUESTION Odd Bodkin <bodkinodd@gmail.com> - 2018-05-17 17:44 +0000
        Re: A GOOD QUESTION Ursula Vankeuren <aln@divweo.id> - 2018-05-19 14:07 +0000
  Re: A GOOD QUESTION Tom Roberts <tjroberts137@sbcglobal.net> - 2018-03-31 18:42 -0500
    Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-20 09:12 +1000
      Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-19 17:53 -0700
      Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-19 17:54 -0700
      Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-19 21:16 -0700
        Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-21 07:36 +1000
          Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-20 14:58 -0700
            Re: A GOOD QUESTION Lofty Goat <rlwatkins@gmail.com> - 2018-04-20 20:00 -0500
              Re: A GOOD QUESTION benj <benj@nobody.net> - 2018-04-20 21:39 -0400
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 19:02 -0700
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 19:16 -0700
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 19:20 -0700
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 19:32 -0700
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 19:47 -0700
                Re: A GOOD QUESTION "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-04-20 20:03 -0700
              Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-20 20:39 -0700
            Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-23 07:52 +1000
              Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-22 16:39 -0700
                Re: A GOOD QUESTION HGW <HW@home.net> - 2018-04-25 12:25 +1000
                Re: A GOOD QUESTION Gary Harnagel <hitlong@yahoo.com> - 2018-04-24 20:34 -0700
  Re: A GOOD QUESTION Keith Stein <keithstein111@gmail.com> - 2018-05-13 09:01 +0100
  Re: A GOOD QUESTION paul jark <jarkpaulsmith@gmail.com> - 2018-05-19 06:27 -0700

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