[General] On photon momentum

[Hodge John]

I do. And it explains diffraction.Hodge 

    On Saturday, January 28, 2017 7:12 PM, Dr Grahame Blackwell <grahame at starweave.com> wrote:
 

   _filtered #yiv6089736424 {font-family:Cambria Math;} _filtered #yiv6089736424 {font-family:Calibri;} _filtered #yiv6089736424 {font-family:Tahoma;} _filtered #yiv6089736424 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv6089736424 P.yiv6089736424MsoNormal {MARGIN:0in 0in 0pt;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 LI.yiv6089736424MsoNormal {MARGIN:0in 0in 0pt;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 DIV.yiv6089736424MsoNormal {MARGIN:0in 0in 0pt;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 A:link {COLOR:blue;TEXT-DECORATION:underline;}#yiv6089736424 SPAN.yiv6089736424MsoHyperlink {COLOR:blue;TEXT-DECORATION:underline;}#yiv6089736424 A:visited {COLOR:purple;TEXT-DECORATION:underline;}#yiv6089736424 SPAN.yiv6089736424MsoHyperlinkFollowed {COLOR:purple;TEXT-DECORATION:underline;}#yiv6089736424 P.yiv6089736424MsoAcetate {MARGIN:0in 0in 0pt;FONT-FAMILY:"Tahoma", sans-serif;FONT-SIZE:8pt;}#yiv6089736424 LI.yiv6089736424MsoAcetate {MARGIN:0in 0in 0pt;FONT-FAMILY:"Tahoma", sans-serif;FONT-SIZE:8pt;}#yiv6089736424 DIV.yiv6089736424MsoAcetate {MARGIN:0in 0in 0pt;FONT-FAMILY:"Tahoma", sans-serif;FONT-SIZE:8pt;}#yiv6089736424 P.yiv6089736424MsoListParagraph {MARGIN:0in 0in 0pt 0.5in;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 LI.yiv6089736424MsoListParagraph {MARGIN:0in 0in 0pt 0.5in;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 DIV.yiv6089736424MsoListParagraph {MARGIN:0in 0in 0pt 0.5in;FONT-FAMILY:"Times New Roman", serif;FONT-SIZE:12pt;}#yiv6089736424 P.yiv6089736424msonormal0 {FONT-FAMILY:"Times New Roman", serif;MARGIN-LEFT:0in;FONT-SIZE:12pt;MARGIN-RIGHT:0in;}#yiv6089736424 LI.yiv6089736424msonormal0 {FONT-FAMILY:"Times New Roman", serif;MARGIN-LEFT:0in;FONT-SIZE:12pt;MARGIN-RIGHT:0in;}#yiv6089736424 DIV.yiv6089736424msonormal0 {FONT-FAMILY:"Times New Roman", serif;MARGIN-LEFT:0in;FONT-SIZE:12pt;MARGIN-RIGHT:0in;}#yiv6089736424 SPAN.yiv6089736424BalloonTextChar {FONT-FAMILY:"Tahoma", sans-serif;}#yiv6089736424 SPAN.yiv6089736424EmailStyle21 {FONT-FAMILY:"Times New Roman", serif;COLOR:#1f497d;}#yiv6089736424 SPAN.yiv6089736424EmailStyle22 {FONT-STYLE:normal;FONT-FAMILY:"Times New Roman", serif;COLOR:#20188c;FONT-WEIGHT:normal;TEXT-DECORATION:none;}#yiv6089736424 SPAN.yiv6089736424EmailStyle23 {FONT-FAMILY:"Times New Roman", serif;COLOR:#993366;}#yiv6089736424 SPAN.yiv6089736424EmailStyle24 {FONT-STYLE:normal;FONT-FAMILY:"Times New Roman", serif;COLOR:#20188c;FONT-WEIGHT:normal;TEXT-DECORATION:none;}#yiv6089736424 SPAN.yiv6089736424EmailStyle25 {FONT-FAMILY:"Times New Roman", serif;COLOR:#003300;}#yiv6089736424 SPAN.yiv6089736424EmailStyle26 {COLOR:black;}#yiv6089736424 SPAN.yiv6089736424EmailStyle27 {COLOR:black;}#yiv6089736424 SPAN.yiv6089736424EmailStyle28 {FONT-FAMILY:"Times New Roman", serif;COLOR:olive;}#yiv6089736424 SPAN.yiv6089736424EmailStyle29 {COLOR:black;}#yiv6089736424 SPAN.yiv6089736424EmailStyle30 {FONT-FAMILY:"Calibri", sans-serif;COLOR:windowtext;}#yiv6089736424 SPAN.yiv6089736424EmailStyle31 {FONT-FAMILY:"Calibri", sans-serif;COLOR:#1f497d;}#yiv6089736424 .yiv6089736424MsoChpDefault {FONT-SIZE:10pt;}#yiv6089736424 DIV.yiv6089736424WordSection1 {}#yiv6089736424 OL {MARGIN-BOTTOM:0in;}#yiv6089736424 UL {MARGIN-BOTTOM:0in;}Dear All,[Notably Chandra & Chip], I'm having a bit of a problem over this question of: 'How does a photon carry momentum'? (or similar words.)It seems to me that in order to even beginning to address this question, one needs a clear definition of 'momentum' that's applicable to the momentum carried by a photon.I may be looking in the wrong places (if so please advise), but the only definitions of momentum that I can find either refer to 'mass' or refer to some other phenomenon which in turn refers to momentum - i.e. circular references.If I'm going to figure, or be persuaded, how a photon carries momentum I first need to know what momentum IS in respect of a photon (yes, I know it's E/c, that's a measure it's not a definition).Of course I'm aware of the paper "Light is heavy", but I don't feel it's appropriate just to extract from that some sort of mass-equivalence of a photon.  If we do, we get the result that 'm'=E/c^2, so 'm'c = E/c - gives the right result, but appears to be some sort of convoluted self-confirmation (i.e. a circular argument dressed up in fancy clothes).  It certainly doesn't DEFINE a photon's momentum, just evaluates it. Does anyone have a convincing definition of momentum that's applicable to a photon?  One that can be used as a firm basis for theorising?(I'd be glad if colleagues didn't use this as an excuse to yet again present their own personal theory/model - I'm looking for a definition that would be agreed by all, or at least most, physicists.) Thanks in anticipation,Grahame
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