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Physics : Recent Questions and Answers (Page 120)

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

How to Measure a Magnetic Field with 2 Molecules of Unknown, but Opposite Spin

You have 2 molecules that are entangled such that they must have opposite spin. However, you do not know which one has the positive spin and which has the negative...

Asked on 08/11/2021 by E Tam

0 answer

Which particle decays are quickest?

The $ρ^0$ and $pi^0$ mesons have the same quark content, (uu*-dd*)/sqrt(2) and have masses of 775 MeV/c^2 and 135 MeV/c^2 respectively. The ρ0 has a lifetime ~ 10^-24s while pi0...

Asked on 08/11/2021 by jjp1996

1 answer

Is eigenfunction for angular momentum operator is unique?

I want to know if the commutation relation for angular momentum, $$left[ J_alpha,J_betaright] = ihbarepsilon_{alphabetagamma}J_gamma$$is enough for defining its unique eigenstate of spin, $lvert s,mrangle$. As far...

Asked on 08/10/2021 by user291938

1 answer

How does force of gravity and centripetal force work at the top of a loop?

I learned that a rollercoaster needs to counteract the effect of gravity by using centripetal force. If the centripetal force is always pointing inwards, toward the centre, how does it...

Asked on 08/10/2021 by aimepie

1 answer

Forbidden transitions from triplet to singlet states in the deuteron?

The dipolar moment for the deuteron is$$vec{mu}_{d}=frac{mu_{N}}{2 h}left{left(g_{s}^{(p)}+g_{s}^{(n)}right) vec{S}+left(g_{s}^{(p)}-g_{s}^{(n)}right)left(vec{s}_{p}-vec{s}_{n}right)+vec{L}right}$$we know could understad that$$left(vec{s}_{p}-vec{s}_{n}right)=0$$in the deuteron if we suppose that proton and neutron are too...

Asked on 08/10/2021

1 answer

Where does the energy for magnetizing a metal come from?

I saw a young man's science project. He asked this question in a different way "does magnetizing something reduce the magnetic field potential of the original magnet?" His...

Asked on 08/10/2021 by user3533030

3 answer

Relative motion of a particle of a moving wave with respect to the wave itself

When deriving the equation for the velocity of a transverse wave in a string of tension $T$ and linear mass density $d$, we assume that a small part...

Asked on 08/10/2021

0 answer

What is the math knowledge necessary for starting Quantum Mechanics?

Could someone experienced in the field tell me what the minimal math knowledge one must obtain in order to grasp the introductory Quantum Mechanics book/course? I do have math knowledge...

Asked on 08/10/2021 by azerIO

6 answer

Path integrals on classical statistical mechanics

I'm learning a little bit about path integrals by myself lately and notice something quick curious. So far, I've learned that path integrals have many applications in physics, including quantum...

Asked on 08/10/2021

0 answer

Mass dimension and Abelian super-gauge transformation

A vector superfield is defined by postulating an invariance under a linear transformation in the space of vector superfields: $V longrightarrow V + iLambda - iLambda^{dagger}$ where $iLambda - iLambda^{dagger}$...

Asked on 08/10/2021 by RM2401

1 answer

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