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 Feb 18 awarded Notable Question Nov 21 awarded Popular Question Nov 6 awarded Nice Question Sep 24 awarded Autobiographer Jun 11 accepted Navier-Stokes equations: conservation of momentum Jun 11 asked Navier-Stokes equations: conservation of momentum May 20 awarded Popular Question Aug 15 comment $\lambda=\frac{2h}{p}$ instead of $\lambda=\frac{h}{p}$? Thanks for the explanation about the proton. For the massive particles, there is something strange about your reasoning. You use the de Broglie relation before you prove it (you proved it for the photon-like particles but not for the massive particles). There must be another way to prove it. Aug 15 awarded Supporter Aug 15 comment $\lambda=\frac{2h}{p}$ instead of $\lambda=\frac{h}{p}$? In the case of a single particle isn't phase velocity equal to group velocity ? I learned that group velocity is defined for wave paquets. Aug 15 asked $\lambda=\frac{2h}{p}$ instead of $\lambda=\frac{h}{p}$? Nov 12 accepted What does transport equation represent in terms of physical quantities? Nov 11 asked What does transport equation represent in terms of physical quantities? Jun 14 comment Concrete example of divergence of a vector field @lurscher, I think I understand now, thanks ! So is it right to say that a magnetic field has no divergence because the same amount of vector flux of this field goes both in and out any volume (because there is no magnetic monopole)? Jun 14 accepted Concrete example of divergence of a vector field Jun 13 awarded Scholar Jun 13 comment Concrete example of divergence of a vector field Thanks for the example Jun 13 comment Concrete example of divergence of a vector field Well I knew about ∂Fx/∂x+∂Fy/∂y+∂Fz/∂z, I just needed some explanation about what it means. Thanks for the links anyway! Jun 13 awarded Student Jun 13 asked Concrete example of divergence of a vector field