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May
2
revised What does it mean physically to set $\exp(ikr)=1$ in the dipole approximation?
added 46 characters in body
May
2
revised What does it mean physically to set $\exp(ikr)=1$ in the dipole approximation?
added 46 characters in body
May
2
revised What does it mean physically to set $\exp(ikr)=1$ in the dipole approximation?
added 46 characters in body
May
2
comment What does it mean physically to set $\exp(ikr)=1$ in the dipole approximation?
Thanks. But is k.r = 0, true for longitudinal DC E field or not ?
May
2
asked What does it mean physically to set $\exp(ikr)=1$ in the dipole approximation?
Apr
30
awarded  Yearling
Apr
27
revised What is the difference between length and velocity gauge when it comes to a dipole approximation?
added 158 characters in body
Apr
27
asked What is the difference between length and velocity gauge when it comes to a dipole approximation?
Apr
20
accepted In Crookes (roentgen) tube where does electrons come from?
Apr
20
asked In Crookes (roentgen) tube where does electrons come from?
Apr
19
accepted Why is second harmonic Intensity periodic in coherent length?
Apr
19
asked Why is second harmonic Intensity periodic in coherent length?
Apr
19
revised Is absorption probality modulated by interferance instanteneous or retarded effect?
added 53 characters in body
Apr
19
revised Is absorption probality modulated by interferance instanteneous or retarded effect?
edited tags
Apr
18
revised Is absorption probality modulated by interferance instanteneous or retarded effect?
added 128 characters in body
Apr
18
revised Is absorption probality modulated by interferance instanteneous or retarded effect?
added 128 characters in body
Apr
18
revised Is absorption probality modulated by interferance instanteneous or retarded effect?
added 12 characters in body
Apr
18
asked Is absorption probality modulated by interferance instanteneous or retarded effect?
Apr
18
revised Why the angular distribution of the X-rays from Roentgen tube is not along the decelaration of electrons?
edited title
Apr
17
comment Why are photonics fibers called band gap fiber?
What is band gap effects ?