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Physics : Recent Questions and Answers (Page 184)

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

Using an electric field to rip apart a nucleus

Can we use an electric field to rip apart a nucleus? . Let's take 3He which is a very stable isotope but unfortunately not commonly found. And let's assume we...

Asked on 07/15/2021 by user272441

3 answer

Are there any known negative heat capacities?

If we take heat capacity to be defined as "the ratio of the heat added to the temperature rise": $$ C=frac{text{d} Q_{rev}}{text{d}theta}$$ then this leads me to ask: can...

Asked on 07/15/2021 by Nick Chapman

4 answer

Combining spins of two particles of spin |1,0> and |1/2, 1/2>

I am trying to combine the spin of two particles. Their individual spins are: $|1,0rangle $ and $left|frac{1}{2},frac{1}{2} right>$ Now I am told that they combine to give...

Asked on 07/15/2021 by helpwithphysics

2 answer

Graviton Scattering Feynman Rules

I am doing a research on extra dimensional solutions to the hierarchy problem in Physics, and I am having trouble with the Feynman rules for gravitons, furthermore, I would also...

Asked on 07/15/2021 by BasylAbdul

0 answer

What happens to the bubbles in this CPU thermal paste? (video)

I've been studying the best method to apply thermal paste and currently thinking the spread method might seem best where you spread an even thin layer across the whole CPU...

Asked on 07/15/2021 by wdbwdb1

1 answer

What is reversible heat?

If found the following question while studying thermodynamics. What is meant by "reversible heat" and when would it be a...

Asked on 07/15/2021

1 answer

Spin $1/2$ motivation for twistor theory in general relativity?

I was watching this Youtube video (I have linked it at the relevant timestamp) and to paraphrase Dr. Woit' s motivation for twistor theory:Within the standard way...

Asked on 07/15/2021

1 answer

Why Bose-Einstein condensate is superconducting

Im looking into Quantum Computing, where the BCS Theory is used to build Qubits with a BEC.Why does the Bose-Einstein Condensate not interact with other particles and hence has...

Asked on 07/15/2021 by Kiji

1 answer

Calculating entropy for the surroundings the logical way doesn't work

EDIT: I was missing the entropy change due to temperature change and now everything makes sense Suppose I have $n$ mol of an ideal gas in a chamber with...

Asked on 07/15/2021 by Gamabunto

1 answer

Doppler shift in current-carrying superfluid

Consider the Hamiltonian ($x=(vec{r},it)=(vec{r},tau)$):$$hat{H}=hat{psi}_{sigma}^{dagger}(x)(-frac{nabla^2}{2m}-mu)hat{psi}_{sigma}(x)-U_{0}int dvec{r}hat{psi}^{dagger}_{uparrow}(x)hat{psi}^{dagger}_{downarrow}(x)hat{psi}(x)_{downarrow}hat{psi}_{uparrow}(x)tag{1}$$ After some manipulations, with $Psi$ defined as Numbu spinor $(psi_{uparrow}, overline{psi}_{downarrow})^{T}$, the partition function and effective action are respectively:...

Asked on 07/15/2021

0 answer

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