Just a dimension analysis of photon momentum!!
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From: Puppet_Sock on 24 Jun 2010 15:37 On Jun 23, 4:59 am, "Y.Porat" <y.y.po...(a)gmail.com> wrote: > the photon momentum can be presented as > > P = hf/c > right [snip irrelevant and messed up dimensional analysis] You got the dimensional analysis wrong. You got the numbers wrong. But that does not matter, as they are in no way related to the question you ask at the end. > now my question is > where do you see anything relativistic in it ??!! P = E/c is the relativistic formula. It tells you the momentum associated with energy E transmitted as light. E = h f is the quantum formula. It tells you the energy per photon of frequency f. So, plugging in, P = hf/c is the relativistic quantum formula. It tells you the momentum per photon of frequency f. That was easy. Socks
From: PD on 24 Jun 2010 17:17 On Jun 23, 3:59 am, "Y.Porat" <y.y.po...(a)gmail.com> wrote: > the photon momentum can be presented as > > P = hf/c > right > it is the full comprehensive presentation > of the photon momentum > nothing missing - nothing excessive right ?? !! > > now lets take it as is > (without changing anything in it as the formula > presenting the **photon momentum * > momentum ie not energy .....!! ) > > and present it by its dimensions and > dimensionless figures > > h is > 6.6 exp -34 > > f is > fs/second > > while fs is*** the dimensionless > figure that is attached to the 1/second **** > > c is say (aprox ) > 3 exp10 meter/second > now if we combine all of it > we get > > P 6.6 exp -Kg meter ^2 /second times fs/Sec > divided by meter/Second times 3 exp10 > > ie if we present it without the > dimensions that are canceling themselves > in nominator and denominator > > we get > ==================================== > 6.6exp-34 Kg MET /SEC times fs/3 exp10 > ==================================== > now my question is > where do you see anything relativistic in it ??!! > > TIA > Y.Porat > ---------------------- Just a suggestion, Porat. Don't title a post that implies that you're going to do dimensional analysis, if you don't know how to do dimensional analysis, if you don't know the dimensions or the units of the quantities you're going to look at, if you think that relativistic quantities have different dimensions than nonrelativistic quantities, or if you think you can learn something about the fundamental nature of a thing by looking at the dimensions of one of its properties. This would be like someone proposing to do the plumbing for a kitchen sink while not knowing what a pipe wrench is, what the hole in the bottom of the sink is for, how to tell which spigot is hot and which one is cold, or why a sink should not be made out of rye bread. PD
From: Y.Porat on 24 Jun 2010 23:50 On Jun 24, 11:17 pm, PD <thedraperfam...(a)gmail.com> wrote: > On Jun 23, 3:59 am, "Y.Porat" <y.y.po...(a)gmail.com> wrote: > > > > > the photon momentum can be presented as > > > P = hf/c > > right > > it is the full comprehensive presentation > > of the photon momentum > > nothing missing - nothing excessive right ?? !! > > > now lets take it as is > > (without changing anything in it as the formula > > presenting the **photon momentum * > > momentum ie not energy .....!! ) > > > and present it by its dimensions and > > dimensionless figures > > > h is > > 6.6 exp -34 > > > f is > > fs/second > > > while fs is*** the dimensionless > > figure that is attached to the 1/second **** > > > c is say (aprox ) > > 3 exp10 meter/second > > now if we combine all of it > > we get > > > P 6.6 exp -Kg meter ^2 /second times fs/Sec > > divided by meter/Second times 3 exp10 > > > ie if we present it without the > > dimensions that are canceling themselves > > in nominator and denominator > > > we get > > ==================================== > > 6.6exp-34 Kg MET /SEC times fs/3 exp10 > > ==================================== > > now my question is > > where do you see anything relativistic in it ??!! > > > TIA > > Y.Porat > > ---------------------- > > Just a suggestion, Porat. > > Don't title a post that implies that you're going to do dimensional > analysis, if you don't know how to do dimensional analysis, if you > don't know the dimensions or the units of the quantities you're going > to look at, if you think that relativistic quantities have different > dimensions than nonrelativistic quantities, or if you think you can > learn something about the fundamental nature of a thing by looking at > the dimensions of one of its properties. > > This would be like someone proposing to do the plumbing for a kitchen > sink while not knowing what a pipe wrench is, what the hole in the > bottom of the sink is for, how to tell which spigot is hot and which > one is cold, or why a sink should not be made out of rye bread. > > PD -------------------- and Mr PD i have a suggestion for you: !!! instead of being a CHEAP demagogue !!! just tell us what is ***YOUR** AGAIN ***YOUR*** DIMENSION ANALYSIS** OF THE PHOTON MOMENTUM (momentum not energy again momentum and not energy !!!) P = hf/Lambda AND TEL US WHAT IS RELATIVISTIC THERE !!! 2 as far as i know you a crook like you -- will not do it !!! for your 'tactical ' cheating reasons !!! because you know i am right !!! if you want to prove that i am wrong with with my analysis --- JUST BRING YOUR ALTERNATIVE ANALYSIS!. THAT IS WHAT AN HONEST PERSON AND AN HONEST SCIENTIST -- WOULD DO !!! and btw do it by the MKS system unless you claim that the MKS is '''not good enough or not legitimate for it ''' !!! and dont just hand wave demagogically adding relevant obfuscating philosophy stories !!! JUST A SIMPLE DIMENSION ANALYSIS INCLUDING THE DIMENSION LESS FIGURES !!! OF YOURS !!! DON T FORGET OR IGNORE THE DIMENSIONLESS FIGURES !!! TIA Y.Porat ---------------------------------
From: artful on 25 Jun 2010 00:11 On Jun 25, 1:50 pm, "Y.Porat" <y.y.po...(a)gmail.com> wrote: [snip] > P = hf/Lambda > AND TEL US WHAT IS RELATIVISTIC THERE !!! Nothing .. that formula is nonsense. Its P = Mc = E/c = hf/c = h/lambda where P is momentum, M is relativistic (or inertial) mass, E is photon energy, f is EMR frequency, lambda is EMR wavelenghh.
From: artful on 25 Jun 2010 00:14
On Jun 25, 1:50 pm, "Y.Porat" <y.y.po...(a)gmail.com> wrote: [snip] > JUST A SIMPLE DIMENSION ANALYSIS > INCLUDING THE DIMENSION LESS FIGURES !!! > OF YOURS !!! > DON T FORGET OR IGNORE THE DIMENSIONLESS FIGURES !!! Dimensional analysis EXCLUDES the dimensless values .. that's the whole point. Its an analysis of the dimensions. And the valid formulas for energy and momentum etc are all trivially correct regarding dimensions. You don't even know what dimensional analysis is. Sad. |