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Physics : Recent Questions and Answers (Page 824)

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

Does the halflife time of a radioactive material decrease if its temperature increases?

If at high temperatures atoms are more intensely interacting with each other or emitted photons that also could make the core vibrate. Is in these circumstances the radioactive material more...

Asked on 09/24/2020

5 answer

Continuity of electric displacement field inside ion solution

I am trying to model transport of ions (calcium, potassium, chloride etc.) in water. The ions move because of the influence of diffusion and electric force and can be modeled...

Asked on 09/23/2020 by abir

1 answer

Density of states of Bogoliubov quasiparticles

For a simple fermionic system the formula for calculating the density of states (DOS) is $N(E) = sum_{n}delta(E-E_{n})$ where ${E_{n}}$ is the set of eigenvalues obtained after diagonalizing...

Asked on 09/23/2020 by swagatam

2 answer

Why is not the $g$-field of the sun considered in the GPS-settings?

I have read this SE-Physics question and its answers, however, I could not find anything regarding the effect of Sun's $g$-field on the GPS clocks. When a GPS...

Asked on 09/23/2020

1 answer

The spin degeneracy and the adiabatic theorem

Consider that we have a system with a time dependent hamiltonian $H(t)$. We consider that the hamiltonian changes from $H(0)$ to $H(t)$, ($t$ large), and we...

Asked on 09/23/2020 by AlfredV

1 answer

Bose-Einstein Statistics and Collapse

In Bose-Einstein statistics, two identical bosons can be in one of the following three states with respect to some orthonormal single particle states $|Arangle$ and $|Brangle$: (1) ...

Asked on 09/23/2020

1 answer

Times associated with Absorption and Emission Processes

I am currently reading the book "Advances in Atomic Physics: An Overview" by Cohen-Tannoudji and Guéry-Odelin. In pages 29-31 the authors discuss a two-level atom subject to a broadband radiation...

Asked on 09/22/2020 by eranreches

1 answer

What is the capacitance of a spoon?

Has anyone measured it? I can't seem to find anything online for "spoon capacitance"; what's the expected (self-)capacitance on the typical household utility metal spoon? The spoon heads bear a...

Asked on 09/22/2020 by OverLordGoldDragon

2 answer

What conceivable connection is there between the cosmological constant and radius of the Universe?

You probably noticed that the radius of the (observable) Universe in Planck lengths $R$ (about $10^{60}$) and the cosmological constant $Lambda$ (about $10^{-120}$) in natural units obey approximately: $$Lambda R^2...

Asked on 09/22/2020

1 answer

Why does specific heat capacity affect thermal diffusivity?

Sorry if this is a simple question, I did my research and couldn't find much. The equation for thermal diffusivity is: $a = frac{k}{pc_p}$Where $k$ is thermal...

Asked on 09/21/2020 by the4naves

2 answer

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