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Relearning physics after more than fifty years.


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24
awarded  Autobiographer
Sep
13
awarded  Popular Question
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
May
17
accepted Hilbert space of a free particle: Countable or Uncountable?
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13
awarded  Nice Question
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7
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Jan
27
accepted What can tunnel through a graphene sheet?
Jan
26
comment Can we observe diffraction even if the slit size is tending to zero?
Thanks for the references. Similarly, I would expect the output from a long narrow slit , where the long dimension is always much longer than a wave length, but the narrow dimension transitions from longer than to shorter than a wavelength to simultaneously transition from unpolarized to linearly polarized light, if it is illuminated by unpolarized light.
Jan
25
comment Can we observe diffraction even if the slit size is tending to zero?
Let's consider the simple case of a round hole. Can you clarify what happens as the diameter decreases from much greater than one wavelength to much less than one wavelength? I presume that a transition from radiative to evanescent behavior will occur when the diameter is approximately one wavelength, but the basic Airy disk pattern will remain the same. Is this true? How fast is the cutoff?
Jan
21
comment What compact central objects younger than the crab pulsar have been seen?
Thanks for the great references and pictures.
Jan
21
accepted What compact central objects younger than the crab pulsar have been seen?
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20
asked What compact central objects younger than the crab pulsar have been seen?
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awarded  Yearling
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6
awarded  Nice Question
Oct
11
revised How is quantum superposition different from mixed state?
added 133 characters in body
Oct
11
answered How is quantum superposition different from mixed state?
Oct
9
comment Is classical electromagnetism a dead research field?
For a contrary view, see Parrott's criticism of Rohrlich's work in arXiv:gr-qc/0502029v3 updated in 08.
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8
awarded  Popular Question
Aug
11
answered Is there a way to increase photon energy by decreasing its wavelength?