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Physics : Recent Questions and Answers (Page 684)

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

What isotope has the shortest half life?

Question: What isotope has the shortest half life?...

Asked on 01/03/2021 by Event_Horizon

5 answer

Ocean waves breaking slowly at the shore during periods of turbulence

During storms, I have often watched ocean waves breaking at the shore as if they were in slow motion. I've wondered if the slow curling of the waves during these...

Asked on 01/03/2021 by Sketcher

1 answer

Entropy for perfect gas, to show that $mathrm{d}S = c_vfrac{mathrm{d}p}{p} + c_pfrac{mathrm{d}V}{V}$

I am trying to show that for ideal gas: $mathrm{d}S = c_vfrac{mathrm{d}p}{p} + c_pfrac{mathrm{d}V}{V}$ But I keep getting an additional term $frac1Tleft(frac{partial U}{partial V}right)_Tmathrm{d}V$. What is...

Asked on 01/03/2021

0 answer

Entropy change for molecular nitrogen

Calculate specific entropy change for $N_2$ from 250 K and 1000 kPa to 1300 K and 60 kPa using $Delta s=phi_2-phi_1-Rln (frac{p_2}{p_1})$ given that $phi_1=6.6587 kJ/kg/K$ and...

Asked on 01/03/2021

2 answer

A discrepancy between the usual interpretation of Bell's theorem and a full theory of quantum gravity

**** This question has been modified following the discussion below. **** Bell’s theorem says, in a nutshell, that “local hidden-variable theories (HVT) cannot exist” (since they contradict QM in Bell...

Asked on 01/03/2021 by LouisV

2 answer

Is this question worded correctly?

I'm trying to solve some questions in dynamics and I came across this problem. I've attempted to solve it first without looking at the answer but after several attempts, I've...

Asked on 01/03/2021 by CroCo

1 answer

Could graviton exist in a single polarisation?

Penrose's twistor theory can only construct a left-handed graviton. This is seen as a problem. But... is there anything wrong with gravitons existing in only one polarisation? How would gravity...

Asked on 01/03/2021

1 answer

Trying to work out the CP-transformation property of the Higgs potential

The parity transformation property of a complex scalar field $phi(x)$ is given by: $$Pphi(t,textbf{x}) P^{-1}=eta_Pphi(t,-textbf{x})$$ where $eta_P=pm 1$. The charge conjugation property of a complex scalar field $phi(x)$ is given...

Asked on 01/02/2021

1 answer

Total angular momentum operator

How do the eigenfunctions of the total angular momentum operator analytically look like? I mean the operator is given by $J = L+S$ so the eigenfunctions have to be...

Asked on 01/02/2021 by Solid State Physicist

2 answer

The origin of the Lagrangian

Is it possible to explain the form of Lagrangian $L=T-V$ in the following way? The force that acts on a mass particle is due to the potential $V(x)$....

Asked on 01/02/2021 by Hulkster

2 answer

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