+Nima Geemon No problem. Should have a few more P1,2,3 coming before the exam on Wednesday. Then several more P4,5,6 before that exam too (if you're doing triple).
If photons are each a packet of carrier waves with an envelope, then how does one, via the correspondence principle, combine them to produce electromagnetic plane waves in the macroscopic scale? If the photons in a beam are spaced too far apart, there will be gaps in the longitudinal and transverse directions, so a detector won't see an oscillating signal with constant amplitude, uniform in space. The photons would have to be packed together, so their envelopes overlap; also their individual carrier waves will have to be in phase, otherwise there will be noise due to random phase "kicks" that leads to a broadening of the spectrum. If each photon is a "pulse", the spectrum of each photon is broad to begin with, unless they are long pulses.
thank u so much. without ur videos, i ll probably b failing right now!
+Nima Geemon
No problem. Should have a few more P1,2,3 coming before the exam on Wednesday. Then several more P4,5,6 before that exam too (if you're doing triple).
P7 and p5 are the most difficult for me, especially when it comes to equations! Ur videos r literally my hope!
this is awesome thank you!
I relied on these videos back in 2015.
Sadly, Mr Jon Sheppard passed away on 29 December 2018, aged 38.
If photons are each a packet of carrier waves with an envelope, then how does one, via the correspondence principle, combine them to produce electromagnetic plane waves in the macroscopic scale? If the photons in a beam are spaced too far apart, there will be gaps in the longitudinal and transverse directions, so a detector won't see an oscillating signal with constant amplitude, uniform in space. The photons would have to be packed together, so their envelopes overlap; also their individual carrier waves will have to be in phase, otherwise there will be noise due to random phase "kicks" that leads to a broadening of the spectrum.
If each photon is a "pulse", the spectrum of each photon is broad to begin with, unless they are long pulses.