When a particle's position is measured, if one considers the wavefunction to collapse then one can assume it collapses into a delta function peaked at the measured position, and then after some finite time the wavefunciton 'evolves' outward away from this position. Does a similar thing happen to ...

In the Schrodinger Equation's solution for electron orbital energy levels of the hydrogen atom there is no temperature dependency. Maybe this is due to ignoring the effects of temperature when deriving the Hamiltonian. No sources I have seen mention any assumptions about temperature. Are electro...

When two reserviors exchange heat, it is considered as reversible heat transfer and entropy is calculated. But when the process is reversible change in entropy of universe must be zero. But why positive value is coming??

I was taught about the equation of continuity in my hydrodynamics classes which is given by : $$A_1V_1= A_2V_2$$ Where $A_1$ and $A_2$ are any two cross sections of a pipe and $V_1$ and $V_2$ are the speeds of the fluid passing through those cross sections. Suppose $A_1$ is $1m^2$ and $V_1$ is $2...