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In the mathematical sense, a wave isany function that moves. In that sense we can consider that any function that complies with the wave equation (let's consider in one...
Asked on 12/13/2020 by OscarR
1 answerI am confused about the duration of the cosmic background microwave radiation.Will it eventually be replaced by same radiation from discrete directions?...
Asked on 12/13/2020
1 answerSuppose you have $N$ particles, each of which can occupy any of $s$ states. In general, you can write the $N$ particle Hilbert space $mathcal{H}^N$ as a product of $1$...
Asked on 12/13/2020 by Wojciech Morawiec
1 answerIn my physics class our teacher taught us about this canoe-man problem, where a man walks across a canoe and due to the "law of momentum conservation", the canoe attains...
Asked on 12/13/2020 by donthababakka
4 answerI am learning QFT, and we discussed that to quantize a complex scalar field, we do this:$$begin{align*} phi(x) &= int frac{d^3k}{(2pi)^3} frac{1}{sqrt{2omega_k}} big( a(vec{k}) e^{-ikx} + b^dagger(vec{k})e^{ikx}big) ...
Asked on 12/13/2020 by UrsaCalli79
1 answerIn an article (over 250 citations) on plasma physics I've read a paragraph which I find very confusing. The authors state that there's a minimum mean free...
Asked on 12/13/2020 by OD IUM
2 answerBy definition, a heat engine absorbs energy and uses that energy to do work. A Curie pendulum doesn't seem to do work when absorbing that energy. Instead, the magnet is...
Asked on 12/13/2020 by MCMisterP
2 answerWhat is the complete general expression for the electric current $i$ induced in a coreless conductive loop of inductance $L$ and resistance $R$ when it is subjected...
Asked on 12/13/2020 by George Robinson
1 answerMany introductory texts and lecture notes on effective field theory (such as this and this) use the example of Rayleigh Scattering to demonstrate power counting and...
Asked on 12/13/2020 by non-standard-models
1 answerIf we had a way to measure the apparent distance to 13billion light year galaxies (parallax or something) what would it be? The light left the source 13 billion years...
Asked on 12/13/2020 by George Todd
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