Recent content by KastorPhys

By the Principle of Superposition, a state vector can be defined as pic.01 also, the state vector can represent a wave function in a continuous case as pic.02 My (1) question is, in pic.03, why the state vector can be pulled out from the integral? I have an idea but I think it should be...

In a Quantum Mechanics Class, my tutor had shown me that the variance Δa2 Δa2 = < ( a - < a > )2 > = < a2 - 2 a < a > + < a >2 > = < a2 > - 2 < a >< a > + < a >2 = < a2 > - 2 < a >2 + < a >2 = < a2 > - < a >2 and my questions are i) why, in step 3, < x - y + z > will become < x > - < y > + <...

Hi everyone, I am trying to find out the Moment of Inertia of a sphere which is all known to be 2/5(m)(r^2) I calculate this in 2 ways. One by triple integration and one by disk method. From the textbooks, moment of inertia should be in the form, dI = (r^2) dm, However, the textbook, University...

Hello everyone, I'm currently a physics student in university. I'm excited to join this community. I am interesting in Quantum Mechanics and hope to see your sharing in the forum.