/sci/ - Science & Math

Why did the universe converge itself so that there were four fundamental forces of nature and not 3- or 5+? what was the deciding factor?

has anyone tried to make a mythological text (something like the simarilion) but structured around the known history of the universe?

it might detail the four forces as being the prime entities and entropy/order being the entity above them or whatever

i think it would be fun, but probably as dense and difficult to read as the silmarilion, which is fine

>mfw EM can obviously be split into E & M

Hai guise!

I'm derping all over my second-year Electromagnetism homework.

"A student is sitting inside a ‘water-feature’ using their mobile phone. The water feature is such that the electromagnetic waves from their mobile phone must pass through 2 cm of water in order to reach the digital network receiver.

"By considering the dispersion relation for a conducting media, show that at the frequency of an Orange digiral network mobile phone (i.e. ~ 1.8 GHz), the water cannot be considered either a very good or a very poor conductor (note: the dielectric constant for water is 50, the conductivity is <span class="math">2 \Omega^{-1} m^{-1}[/spoiler]"

From what I can decrypt from my lecture notes, the "dispersion relation" is

<div class="math">k^2 = \epsilon \mu \omega^2 + i \omega \mu \sigma_N</div>

and I know that <span class="math">\mu = \mu_0[/spoiler] because water isn't magnetic, but I'm really not sure as to the physical significance of k, whether or not I'm supposed to just plug numbers into this or do something else, or how this lets me know how good or bad a conductor water is...

If I solve it how I guess, then I get <span class="math">k = 8.9648... \times 10^7 + i(0.000158533...)[/spoiler], but what does it mean? D:

Pic semi-related.

Could Gravity, Strong, and Weak interactions all just be variations or byproducts of EM interaction?