There is a lot of documentation about magnetic and electric fields being perpendicular in plane waves, I'd like to know if these two fields are perpendicular also in spherical wave. Is it possible to find an analogous formula to the one used for plane waves? $$\vec E=\vec B \times \vec c$$ (where...

I can't find this, but i've seen that GR is the only possible theory of gravity if you assume causality and principle of equivalence?

Many sources that say in free broadening of a Gaussian wavepacket, the momentum uncertainty (I think defined in terms of the range of 'significant' momentum amplitudes) is time invariant even as the Gaussian wavepackets broadens in position. I'm trying to reconcile how this is consistent with the...

Let's say that I held a hot object with a warm cloth. It instantly feels less hot and only warm to the touch. This is because the cloth is an insulator and doesn't allow as large a heat transfer as if I held the object with my bare hands. However, I presume that eventually the cloth will reach th...

At 9:07 in the latest Veritasium video, we see a map showing elevated levels of iodine-131 in the United States. The big band through the mid-west makes perfect sense to me; nuclear weapons tests loft iodine into the atmosphere, and it eventually falls out with rain. What doesn't make sense to ...

When reading about Astra satellites on Wikipedia (https://en.wikipedia.org/wiki/Astra_1KR), I saw that the period of the Astra 1KR satellite, positioned at 19.2° E, is 1,436.1 minutes (source: NORAD data). That is 3.9 minutes short of a day (1440 minutes), how is that possible with the satellite ...