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In the following Wiki derivation of the Bose-Einstein distribution, a geometric sum is used to make the following step $$sum_{n=0}^inftyleft (exp left (frac{mu -epsilon}{k_B...
Asked on 09/08/2020 by Lopey Tall
1 answerSuppose I have some conserved charge in a 2 dimensional CFT$$Q(|z|)=int_{w=|z|}text{d}w,T(w).tag{1}$$The infinitesimal transformation induced on a field $phi$ at $z$ is then$$[Q(|z|),phi(z)]=int_{w=|z|}[T(w),phi(z)].tag{2}$$Books...
Asked on 09/08/2020
1 answerAssuming that water ( total amount $Q$) flows down from one river/drain, into multiple rivers/drains, under the action of gravity, as shown below: ...
Asked on 09/08/2020
1 answerWhat are the differences between using x-rays and ultrasounds for medical diagnosis? From a physical point of view I am aware that x-rays are able to reach deeper into the...
Asked on 09/08/2020
1 answerIn faraday's law it mention's direction of EMF( like in closed loopit is clockwise or anticlockwise depending on direction of motion of magnet) but defination of EMF is roughly Potential...
Asked on 09/08/2020 by user233089
1 answerSo if we look at the inhomogenous Helmholtz equation begin{equation}nabla^2 u+k^2u=-fend{equation} and include the sommerfield boundary condition begin{equation}lim_{r rightarrow infty } r^frac{n-1}{2}(frac{partial}{partial r}-ik) u(rx)=0end{equation}...
Asked on 09/07/2020 by Bulbasaur
1 answerImagine two evaporative cooling experiments: In the first, a beaker contains a known volume of liquid. The liquid starts at ambient temperature. The temperatue of the body of liquid remaining...
Asked on 09/07/2020 by Dleaf12
1 answerHow to calculate the time it would take for a hydrogen atom to collapse if Rutherford's model were correct? I tried using the relation between power (Larmor formula) and energy...
Asked on 09/06/2020 by Aya
1 answerI recently came across the concept of a $delta'(x)$ (delta prime) potential, which is basically a potential which imposes the boundary condition:$frac{partialpsi}{partial x}$ is 'continuous' at $0$,...
Asked on 09/06/2020 by GSofer
0 answerIn his paper Quantized Hall conductivity in two dimensions, Laughlin considers a ribbon of two-dimensional metal bent into a loop ofcircumference $L$, and pierced everywhere by...
Asked on 09/06/2020 by Bosnia
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