Recent content by Cspeed

Thanks, but I'm not sure still. I knew that power was proportional to the square of amplitude, but I'm hoping to get a figure in watts. I see that I need H as well. But how does this all fit into my 1-D scenario?

I would like to calculate the power of a beam of light once I know the electric field amplitude. For example if I know the amplitude along a line from -1 meter to +1 meter every 0.5 m is [1, 2, 2.5, 2, 1 V/m], how can I find the power from this is? Is there enough info? (it's in vacuum/air)...

Yes, I'm interested in 1st jobs. Can you explain which kinds of jobs wouldn't be very specialized?

I'm bumping this thread because I was about to ask the same question. Does anyone else have suggestions? Basically about which EE subfields have the most jobs now and in the near future? And this doesn't just include "popular new emerging fields" but also old fields if they will be in high...

Thanks for the explanations, but I am a little surprised. I always felt that there was some "right" way to write algebraic expressions. For example, in published mathematical papers, I'm sure they strive for consistency, so that from article to article you don't have radicals coming first one...

Does anyone know if there is a list of the order that goes in writing a mathematical expression (i.e. 7 \pi \sqrt{5} vs 7 \sqrt{5} \pi )? Is there a generally accepted method?

Wow, that's a great guide. I'll go ahead and try that out then.

I probably have 100-200 turns of 28 AWG, insulated. Does the length of the nail matter? It's about 0.5 cm diameter, 6cm length.

I'm trying to build a telegraph key and sounder. The sounder that I have designed (well, saw online) is a metal nail (which is ferromagnetic) with at least several dozen (maybe 200+) turns of wire around it. When a current is on the wire, the nail should become an electromagnet, and then pull...

Wait - I just remembered something. I thought I heard that it's good to stop up a f/1.8 max aperture lens, for example, to 2.5 or so to reduce CA. And you would stoop up a f/2.5 max aperture lens to 3.2 or whatever to keep the CA from being too severe. Can anyone say if it matters what the MAX...

I don't fully understand the 'exit pupil,' but can you confirm that increasing the aperture from f/3.5 to f/22 increases the exit pupil diameter and causes more aberrations?

Do you have any idea how much the CAs decrease as you decrease the size of the 'hole?' Does making the opening a little bit smaller reduce it mostly, or is it more of a linear relationship, so that half the diameter of opening means half as much CA? My guess is the latter.

Thank you! That was so obvious and I don't know why I missed it. But what about aperture?

I understand that chromatic aberrations occur because the different wavelengths of light are separated, but I don't exactly understand what conditions control it. I understand the photography aspect better than the physics of this subject now. I know that CAs are most common at the edges of...

Out of curiousity, as far as balancing out with the magnetic force of the Earth, what would happen using two magnets instead of one? Could the force be expected to double from the magnets?