Re: Tracking


Erik Max Francis wrote:
Wayne Throop wrote:

Shrug. And if doppler says it'd have imaginary energy when emitted[1],
then it'd have imaginary wavelength. Or vice versa. I don't know why
this should be puzzling. It may be unphysical, but not puzzling.

[1] Yes, I realize that this is cheating a bit, given what doppler
is supposed to be calculating. But only a bit. The cheating is,
however, related to the fact that photons do not have, intrinsically,
wavelength of energy. Those things depend on how fast the object
that absorbs them is moving. Similar for kinetic energy, etc, etc.
Conserved but not invariant, and all that.
signal propogation, so

I don't follow this. The energy of a photon is E = h nu. Wavelength
lambda and frequency nu of a photon are related by lambda nu = c. If
the frequency is supposed to be imaginary, then the energy is also
imaginary, not negative.

I follow the part about using the Doppler shift for light to conclude
that the frequency (or wavelength) would be imaginary (although that's
simply taking an equation outside of the domain where it applies). But
I don't see how that's supposed to relate to a negative energy, because
if that were the case, energy would also be imaginary.

Multiply by the imaginary proper time, and it comes out negative. One
wouldn't actually multiply by the imaginary proper time, because, as
Wayne said, it's already been accounted for. But the suggestion was
made, so I decided to play with it.

-l.

.

Relevant Pages

  • Re: an electron question
    ... |> photon. ... we obviously obtain the total amont of energy ... wavelength. ... a photon upon detection, eq. ...
    (sci.physics)
  • Re: an electron question
    ... The energy ... |> Assuming the volume is of order of the photon wavelength we sub ... |> too small wrt its wavelength. ... | the magnetic energy of the electron from infinity to r_c ...
    (sci.physics)
  • Re: an electron question
    ... Sure but the normalization box follows the size of the photon ... IOW, for a 1 millimeter wavelength photon, the "box" ... |> | energy that more closely corresponds to the electron being ...
    (sci.physics)
  • Re: Basics series proposed
    ... The assumption seems to be that individual photon energy ... > frequency means there must be a change in photon energy. ... > In terms of speed, wavelength, and frequency: ...
    (sci.physics)
  • Re: How long is a photon?
    ... A photon is a quantum object from ... |> somewhere in that energy density volume. ... |> only has frequency or wavelength and helicity. ...
    (sci.physics)