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The textbook (Scott Dodelson, Modern Cosmology, Section 2.2 Distance, Page 35-36) states as follows:Another way of inferring distances in astronomy is to measure the flux from an object...
Asked on 01/01/2021 by Wang Yun
1 answerI was following sidney coleman videos and lecture notes where he claimed that unique ground state requires spinless harmonic oscillator while spin introduces degeneracy in the ground state corresponding to...
Asked on 12/31/2020 by Sakh10
2 answerI'd like to know what a piezoelectric sorption detector is. I can hardly find information about, only a small number of research papers which are mostly not accessable for me....
Asked on 12/31/2020
1 answerLight are made of waves in the electromagnetic field, so I wonder what is the shape of that wave. I mean what would be the EM field surrounding a photon...
Asked on 12/31/2020 by nadapez
2 answerI have read two different explanations for evaporative cooling. The first is from my physics textbook: "As heat is transferred to a liquid, the average kinetic energy of its molecules...
Asked on 12/31/2020
3 answerI have an arbitrary magnetic field that varies with time, and I'm trying to numerically model the induced current in a resistive loop over time. Details below.I'm building an...
Asked on 12/31/2020 by Luke
1 answerAs far as I can tell temperature seems to be defined as something like average kinetic energy per molecule, but not quite. It looks like it measures something proportional to...
Asked on 12/31/2020
2 answerI often see and hear people claiming that "the gravitational force is much weaker than the electromagnetic force".Usually, they justify it by comparing the universal gravity constant to Coulomb's...
Asked on 12/31/2020 by ByoTic
3 answerI am just wondering the 4 Maxwell equations (i.e Fadaray Law, Maxwell-Ampere) are Lagrangian or Eulerian description? Does it really matter?...
Asked on 12/31/2020 by Abdoulaye ndiongue
1 answerI have a plastic housing (for a printed circuit board- PCB) in the shape of a box (a *b *c) with L (thickness). Its material properties are: *thermal conductivity: ...
Asked on 12/31/2020 by Gorazd
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