# Search results for query: *

1. ### MATLAB How to spin the colormap in 2 different circles in matlab

Hi, I'm trying to rotate 2 different plotted circles in matlab, which have the Jet colourmap. Colormap has the Spinmap function, but when I use it, it only spins the Jet colormap in 1 circle, leaving out the other. I would like to spin the Jet colormap in2 different circles in opposite...
2. ### Orthogonal Polarisation in EM waves and Interference

Aha, I understand you. Thank you very much Blue Leaf Very helpful to always remember that a phase shift of any multiple of ##\pi## will result in a linear wave.
3. ### Orthogonal Polarisation in EM waves and Interference

What could be orthogonal physically, is not necessarily orthogonal to EM systems. So, what I mean here is whether an EM system would differentiate between the 2 waves, although they interfere with one anther? Or will their polarisations prevent this interference, and have the system see them as...
4. ### Orthogonal Polarisation in EM waves and Interference

It seems to be linear (although I read a few days ago, that Vertical+Horizontal results in circular polarisation, so I may/must be wrong), but I will need to brush up on the mathematical representation of the circular and elliptical waves. I haven't done physics for a long time, so I appreciate...
5. ### Orthogonal Polarisation in EM waves and Interference

I've been trying to get my head around Polarisation and how it achieves orthogonality. I'm not sure if this should be in Physics or Electrical Engineering Section. (Mods can move this where appropriate) I know that 2 EM wave with linear polarisations where one wave is shifted by π, they would...
6. ### Why do EM waves of longer wavelengths spread out more?

The thing that confused me was the fact that this Phenomena is usually expressed from the point of view of "Obstacles" and "Slits", while I'm speaking of "Free Space" and "No Obstacles". But, if the Antenna itself that radiates the beam would be considered like that slit, where radiation is...
7. ### Why do EM waves of longer wavelengths spread out more?

Why do longer wavelengths spread out more than shorter wavelengths? What is the physics principle/law which explains why radio waves spread out more than optic waves in free space?
8. ### Faster than Light... Superluminal Group Velocity

If general relativity in the formal sense constrains all velocities to the speed of light as a maximum, how would superluminal group velocities exceeding speeds of light (at their superpositions) be evaluated in mainstream physics? Would this be a case of General Relativity and Physics...
9. ### Is the Acousto-Optic Effect correlated to wavelength/colour?

I mainly get text from research repositories related to university, that's why it may not be accessible if I link to papers in journals like I previously did. There are general papers available on google though. I will try to gather some links and post them. They are mainly around Crystals and...
10. ### Is the Acousto-Optic Effect correlated to wavelength/colour?

This question is speaking purely of the Acousto optic effect in lasers and solids. Not liquids. I see most research deals with the light as a whole and not the subsequent frequency components (separate colors) of light.
11. ### Is the Acousto-Optic Effect correlated to wavelength/colour?

Would the Acousto-Optic effect be different for different colours of light or rainbow? Or it would treat all wavelengths of light in a white beam the same? Would one colour witness a greater acousto-optic effect than the other? Please explain. Thank you.
12. ### B What is the Quantum of Sound in Gases and Air

It is usually referred to as Phonons for sound waves in solid. But, where it gets confusing, is in gases and air. Some still call it Phonons, others say, Phonons can only be used in solid states. So what is the Quantum of Sound in Gases/Air? And if possible, refer to any text which speaks of...
13. ### Why do concerts not impact the way we see light?

The conclusion of the paper says: "Sound pressure was able to be measured by a laser doppler velocimeter through the optical phase modulation due to the acoustic-optic effect of air" So it's not so insignificant as to not cause any phase change. But perhaps not strong to influence the frequency.
14. ### Why do concerts not impact the way we see light?

That's what I originally thought. However, an IEEE paper and other papers did experiments on the interaction in air. So this further confused me. - For those who can't access the paper in IEEE - It is a paper which reports the measurements of Sound Pressure via the acoustic-optic effect in air...
15. ### Why do concerts not impact the way we see light?

If concert environments are saturated with sound, why don't we witness a change in light colours (frequency shift) or reflection or any other effect witnessed in laboratory experiments documenting acoustic-optic effects?
16. ### I A Function for multiple 2D Gaussians

I just realized that, thank you for pointing this out. You're right. Thank you very much
17. ### I A Function for multiple 2D Gaussians

Great, thank you for your tip.
18. ### I A Function for multiple 2D Gaussians

Would it be more proper/clearer to use only the first ##f## and go on directly to saying ##=... ## instead of redefining what ##f## function is? Thank you for your answer and affirmation.
19. ### I A Function for multiple 2D Gaussians

Yes, that's what I'm looking for. But I'm worried about the notation, and placement of the i Is it also correct for me to say ΣGaussians to represent how many hills, n? - Or there's a more formal notation for that?
20. ### I A Function for multiple 2D Gaussians

I'm trying to put together a function that sums multiple 2D Gaussian functions in one graph (i.e.; multiple Gaussian pyramids). So far from my research, I formed the following function definition: I'm not sure if my research led me to the correct way of forming the function. Is this how...
21. ### What composes the E Field of the Electromagnetic Wave?

Yes, now I'm beginning to understand it from the concept of models, rather than 'thing'. A quantified model of observations and phenomena. Thank you.
22. ### What composes the E Field of the Electromagnetic Wave?

Aha, thank you, it makes more sense now.
23. ### What composes the E Field of the Electromagnetic Wave?

Thank you for your answer. Yes, I did mean whether other things than electric charges generate or cause changes in the EM field.
24. ### Is it possible to learn Physics Maths without suffering?

Thank you. Yes I'm speaking about Physics research papers. 70% complex mathematics and 30% english with mathematical symbols:) I guess I will start with MIT calculus and hope things go smoothly. Appreciate your advice.
25. ### Is it possible to learn Physics Maths without suffering?

I'm reading Physics papers, and every time I open a paper, all I see is maths and symbols I never seen before and it's just all too overwhelming! For someone who's been away from maths for a long time due to different careers, how would they ever come to understand this maths? It seems so...
26. ### What composes the E Field of the Electromagnetic Wave?

That's pretty much what I got from reading some sources on quantum ED. There is no explanation of what a field really is. Or infact, what drives the disturbance, which they say it is the Photon as a Propagator, but others describe the EM fields as the Photons themselves. Which drove me to...
27. ### What composes the E Field of the Electromagnetic Wave?

What composes the E Field of the Electromagnetic Wave where "disturbances" for propagation occurs? If electromagnetic waves cause disturbances in the Electric Field… what “is” in this E Field which photons Interact with? I ask because in Vacuum, there are no electrons to excite. So what is...