Re: Error in Weisstein's redshift
- From: John C. Polasek <jpolasek@xxxxxxxxxx>
- Date: Sun, 29 Jan 2006 01:26:04 GMT
On 28 Jan 2006 16:44:42 -0800, xxein@xxxxxxxxxxxxx wrote:
>
>John C. Polasek wrote:
>> Take a look at this site:
>> http://scienceworld.wolfram.com/physics/GravitationalRedshift.html
>> I believe they have the wrong formula for change in L (lambda) vs
>> gravity. They show
>> L/L0 = sqrt(1 - 2MG/r^2c),
>> where L0 is the "rest" WL and L is the "shifted" WL. It shows the WL
>> would be shifted lower, a blue shift, when gravity makes red shift.
>> It would be OK with f/f0, but they derived it using Newton, at which
>> point they got it upside down, or so it seems to me.
>>
>> John Polasek
>> http://www.dualspace.net
>
>xxein: L/L0 = sqrt(1 - 2MG/r^2c) is not the same as sqrt(1 -
>2MG/rc^2).
>
>It should not seem upside down with this correction to your copy.
I mis-typed and should have put rc^2. But it still looks wrong. The
"shifted" WL L can't be lower than the "rest" L.
John Polasek
.
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