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Physics : Recent Questions and Answers (Page 227)

Find answers to your questions about Physics or help others by answering their Physics questions.

What is the physical significance of the rate of change of a body's momentum with respect to the displacement it travels through, $dp/dx$?

This is something I've been trying to wrap my head around as I review mechanics, particularly conservation laws, in depth. I see the conservation of momentum and conservation of energy...

Asked on 06/29/2021 by Leo Webb

2 answer

The internal energy of a real gas

I apologise in advance, but I am asking for clarification. I learnt from a first year undergraduate physics book that in the case of ideal monatomic gases, the internal energy...

Asked on 06/29/2021

1 answer

Interpretation of scattering plane waves in quantum mechanics

When treating scattering theory in (non relativistic) quantum mechanics, one at first considers the simple setup in which a plane wave impinges on a scattering potential, and one considers a...

Asked on 06/29/2021 by Marco Venuti

0 answer

How can Valentini's subquantum measurement work if particles cannot affect the wavefunction?

In Brown and Wallace's 2005 paper, it is argued that the corpuscles in Bohmian mechanics are ontologically unnecessary, as they play no role in solving the measurement...

Asked on 06/28/2021 by user234683

0 answer

Why does a difference in potential of 4.9 volts cause the electrons to move with an energy of 4.5 eV instead of 4.9?

My textbook, when talking about the Franck-Hertz experiment, says that the intensity of the current starts going down when the difference in potential reaches 4.9 V (or...

Asked on 06/28/2021 by negativeonetwelfth

0 answer

Is there a contradiction between the continuity equation and Poiseuilles Law?

The continuity equation states that flow rate should be conserved in different areas of a pipe: $$Q = v_1 A_1 = v_2 A_2 = vpi r^2$$ We can see...

Asked on 06/28/2021

2 answer

Does neutron decay have an additional factor of 2 in the decay rate?

In neutron decay, a down quark decays into an up quark. Does the fact that there are two down quarks with the possibility of decaying contribute a factor of 2...

Asked on 06/28/2021

0 answer

Interaction Picture Propagator

From Page.81 of Peskin and Schroeder... we note that $U(t,t_0)$ is the unique solution, with initial condition $U(t_0,t_0) = 1$, ofa simple differential equation(the Schrodinger equation):$...

Asked on 06/28/2021 by Anagh Venneti

1 answer

Phase change of reflecting sound wave in tube?

I have an exam question, where they ask me to find the mathematical description of a standing soundwave. They want me to find the displacement wave function $y(x,t)$ and...

Asked on 06/28/2021 by mhj

1 answer

Time reversal of Bloch Hamiltonian (at TRIM points)

I know that time-reversal symmetry requires the Bloch Hamiltonian $H(textbf{k})$ to transform as:$$Theta H(textbf{k}) Theta^{-1}=H(-textbf{k})$$where $Theta$ is the time-reversal operator. Now, let me...

Asked on 06/28/2021

2 answer

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