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 Oct 17 revised Second Law of Thermodynamics…confusion over an example added 820 characters in body Oct 17 comment Second Law of Thermodynamics…confusion over an example No, light from the sun is distributed in solid angle. The solid angle distribution is important to the thermodynamic characteristics. Oct 17 answered Second Law of Thermodynamics…confusion over an example Oct 15 comment Average of $\sin^2 \omega t$, $\cos^2 \omega t$ for long times I think you wanna drop the square on the cosine in the right hand side. Sep 26 answered Why don't charges move transverse to an EM wave? Sep 19 answered Why do wave packets spread out over time? Sep 18 awarded Supporter Aug 14 answered If I replace all my lights with LEDs will my heating costs increase? Apr 11 awarded Editor Apr 11 revised How does one find the wave velocity and the phase speed? added 726 characters in body Apr 10 comment How does one find the wave velocity and the phase speed? No, by 'speed' I mean speed. Both the high frequency component an low frequency envelope are translated at the same speed 'v'. Apr 10 awarded Teacher Apr 10 answered How does one find the wave velocity and the phase speed?