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It is commonly shown that the magnitude of the band gap at the edge of the 1st Brillouin Zone is equal to twice the Fourier component of the potential energy...
Asked on 09/25/2021 by AlphaBaal
1 answerI have been thinking about the problem of relativistic path integrals and I encountered several difficulties.Let's assume we have a particle initially a position $x_i$ at $t_i$...
Asked on 09/06/2021
1 answerI'm sort of confused by this... let's just say the bulbs only emits green light, and we compare a 40 W and 100 W bulb (identical except one is brighter...
Asked on 09/06/2021 by anthonydoesntknowhowtocode
3 answerA ceiling fan creates a vertical circular airflow. Does this airflow along a window or a door in the room reduce the airflow through them? I would guess air trying...
Asked on 09/06/2021
2 answerIn classic physics, kinetic energy is defined as$$KE = frac{1}{2}m v_x^2 + frac{1}{2}m v_y^2 + frac{1}{2}m v_z^2$$So, by defining $ KE_x = frac{1}{2} m v_x^2 $...
Asked on 09/06/2021 by Hayashi Yoshiaki
3 answerIn almost all physics books I've seen it says that the back-emf generated across inductor causes the delay in current (current is shifted 90 degrees with respect to the voltage...
Asked on 09/05/2021 by user4205580
2 answerIn quantum information, we frequently use the trace distance (see definition) to look at how similar two states are. If I had a known complete set of...
Asked on 09/05/2021 by A15234B
1 answerI was doing a propagation of uncertainty on the following numbers, and I got a lower error from the calculated quantity than the measured quantities. So why is it that...
Asked on 09/05/2021
1 answerI'm studying qft from Srednicki's book. If one writes down the full $iepsilon$ terms, passing from Eq. (6.21) (non-perturbative definition) to Eq. (6.22) (perturbative definition) yields$$left<0|0right>_{f,h} =...
Asked on 09/05/2021 by pathint
2 answerI've been analyzing "ball hits a rod in space" type collisions, where speeding ball transfers part of its kinetic energy during elastic collision to the motionless rod, making it gain...
Asked on 09/05/2021 by Hypasist
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