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Physics : Recent Questions and Answers (Page 46)

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

Spherical symmetry of Cooper pair wave function

Can someone please explain to me how the wave function of a Cooper pair is spherically symmetric?...

Asked on 10/04/2021 by dgwp

1 answer

Why does the $rm H$-burning Shell do the $rm CNO$ cycle instead of the $pp$ Chain?

A star that initially produces energy through the $pp$ Chain will eventually exhaust its Hydrogen leading to a core contraction in order to increase the temperature to generate again...

Asked on 10/04/2021

1 answer

Why does the orbital period not depend on the semi-minor axis?

In Kepler's Third Law, the orbital period is described by $$T=2pisqrt frac{a^3}{mu}$$ where $a$ is the lenght of the semi-major axis. I wonder, why does the lenght of...

Asked on 10/04/2021

1 answer

Irrep decompositions for $SO(N)$ tensors for $N>3$

How do I take a tensor products of $SO(N)$ irreps and decompose it in terms of irreps for $N>3$? (I understand the special case of $SO(3)$ we...

Asked on 10/04/2021

1 answer

Why nuclear spin is ignored in Stern-Gerlach experiment?

I can't sure what isotopes of silver(107 or 109) was used. But Silver has non-zero nuclear spin since the number of proton and neutron are not even. Since we use...

Asked on 10/04/2021 by min Fe

1 answer

Winding number as topological invariant in Su-Schrieffer-Heeger (SSH) model

I'm studying the SSH model, here's the reference. I don't get what the definition of a topological invariant is in this case. I think the important property...

Asked on 10/04/2021

1 answer

Is it legal to add two physical quantities that behave differently under time-reversal, parity etc to define a new that has no definite behaviour?

In physics, can we legally add two physical quantities that behave differently under time-reversal or parity? For example, let $vec{a}$ and $vec{b}$ are two observables. Let $vec{a}$...

Asked on 10/04/2021

1 answer

Confusion about the meaning of steady current

I am trying to learn some elementary EM, but I have some confusion about the basic concepts of steady current. Suppose I have a wire of uniform cross section area....

Asked on 10/03/2021 by julyfire

2 answer

Deriving the Schwinger-Dyson equation in Srednicki

In Srednicki pg.136, he derives the Schwinger-dyson equation from:$$0=delta Z(J)=iint Dphi , e^{i[S+int d^4y, J_bphi_b]}int d^4x(frac{delta S}{delta phi_a}+J_a)deltaphi_a.tag{22.21}$$ Then we apply $n$ functional derivatives wrt....

Asked on 10/03/2021 by YONGAO

2 answer

Is Viziv's surface wave technology plausible?

Viziv Technologies is a company that claims to be able to transform power delivery, signaling and safety. Their "Science" page says:The Zenneck surface wave is a technological...

Asked on 10/03/2021

3 answer

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