Coolcrab
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 Apr 7 awarded Famous Question Sep 20 comment Expectation value of number operator $\hat{n}$ So if $\hat{n} = aa^{+}$ (Lowering and raising operator) it comes out $n + \frac{3}{2}$? Sep 20 comment Expectation value of number operator $\hat{n}$ But where do the bra's come from? I only have ket's now Sep 20 asked Expectation value of number operator $\hat{n}$ Oct 16 awarded Notable Question Jun 29 awarded Scholar Jun 29 accepted Determining the center of mass of a cone May 15 awarded Custodian Mar 27 awarded Popular Question Sep 29 awarded Editor Sep 29 revised Determining the center of mass of a cone added 11 characters in body Sep 29 comment Determining the center of mass of a cone Ofc its not, and thats my problem. It's either my bounds or the r should be a z. I'm not sure. Sep 29 revised Determining the center of mass of a cone edited tags Sep 29 comment Determining the center of mass of a cone They are not homework, and I did do the sum just making a mistake somewhere. And asking for help with that.. Sep 29 asked Determining the center of mass of a cone Jul 18 awarded Student Jul 17 comment Liquid crystal polarizes light reflection question Thanks, I understand now! Jul 16 comment Liquid crystal polarizes light reflection question But how exactly? The light with the correct wavelength passes trough unafected, while the rest gets polarized and whatnot. After that most of these crystals have a black layer to absorb everything that comes trough, but why doesn't the light of the correct length get absorbed? Jul 16 asked Liquid crystal polarizes light reflection question