# Tag Info

Accepted

Accepted

### Schrodinger basis kets with Time-dependent Hamiltonian

The basis of the Hilbert space in Schrödinger's picture is assumed to be time-independent regardless of any properties of the Hamiltonian. The Hamiltonian is just another operator. If the Hamiltonian ...
• 173k

### Infinite quantum well width $L$ to $2L$ adiabatic process

After the process ends, the new energy levels will be just the normal energy levels of infinite quantum well with width 2L. moreover, by the Adiabatic theorem: A physical system remains in its ...
• 1,295
Accepted

### Why the air is more compressed near to the ground

If you have a glass of water, every molecule of water is under the influence of the gravitational potential field. Each molecule pushes down on the molecules below. The molecules of water near the ...
• 1,088
Accepted

### Can a process be adiabatic and isobaric? Or Isovolumetric? Or isothermal?

If your system consists of single component, single phase substance, then its thermodynamic state is completely determined by specifying any two of its state variables. Therefore, a process cannot ...
• 6,157
Accepted

### Why is $C_{V}$ allowed in this equation $\Delta E_{int} = nC_{V}\Delta T$ for an adiabatic process?

The internal energy of an ideal gas is a function only of temperature. So, for an ideal gas, it doesn't matter whether the volume is constant or not. The subscript v refers to how $C_v$ of a gas can ...
• 27.9k

### Two gases separated by a movable piston in a cylindrical container

Assume the initial volume on either side of the piston to be $V$. After the piston is released and we allow everything to come to thermal equilibrium (the temperature is then $T$ on both sides), the ...
• 34.4k
Accepted

### Why doesn't reversible adiabatic expansion generate heat?

I like this question! We rarely think about these processes so explicitly, but they can teach us a bit about what's going on microscopically. I'll consider a very concrete model and solve it. Let's ...
• 95.3k
Accepted

### Does a fast process always have to be adiabatic?

If a process is rapid enough that there is little heat transfer between system and surroundings then treating it as adiabatic serves as a good first approximation (an adiabatic process strictly ...
• 6,157
Accepted

### Explanation of the diabatic basis

Recently, I have also came across this definition. Somehow, the concept is poorly explained in recent literature. Therefore, I went back to the original Zener's paper: Proc. R. Soc. Lond. A 1932 ...
• 56