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Physics : Recent Questions and Answers (Page 567)

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

Does spin direction of massless fermions require anti-particles?

If neutrinos were massless (which of course they are not), they would come in two types. The left-handed neutrino and the right-handed anti-neutrino. Therefor to get an "up" state ...

Asked on 02/14/2021

0 answer

Lorentz Force on a Current Carrying Wire

Does the Lorentz Force on a Current Carrying wire given by the equation $$mathbf{F} = I int text{d}ell times mathbf{B}$$ constitute an action reaction pair? That is, if i...

Asked on 02/14/2021 by aren't eistert

3 answer

Taking Fourier Transform to momentum space

I have a wave function$$psi(x) = frac{1}{sqrt{sigmasqrt{pi}}} exp left (frac{-x^2}{2 sigma^2} right ) exp left (frac{ipx}{hbar} right )$$And I have to convert this to $Q(p)$, in...

Asked on 02/13/2021 by AntimoniumHeptadiene

1 answer

Doublets and Triplets in Hydrogen

Is it possible for a hydrogen spectrum to show doublets and triplets? My guess is that it is impossible as triplets and doublets are caused by the transition of electrons...

Asked on 02/13/2021

2 answer

Consequence of stress-energy tensor vanishing on-shell?

Let's say we have a QFT, which off-shell has a non-zero stress-energy tensor, but vanishes when the equations of motion are applied. If the stress-energy tensor vanishes off-shell, then all...

Asked on 02/13/2021 by fewfew4

0 answer

When is a logarithm of the wavefunction well-defined?

It is sometimes convenient to write the wavefunction as$$Psi(x,t)~=~ e^{Phi(x,t)}$$and then work with $Phi$ instead. This is particularly sensible in the context of the...

Asked on 02/13/2021 by Scott Lawrence

1 answer

Significant figures vs. absolute error

On NIST Avogadro's Number, $N_A = 6.022;141;29 times 10^{23} text{ mol}^{-1}$ has 9 significant figures and a standard uncertainty of $0.000;000;27 times 10^{23} text{ mol}^{-1}$. First, can it...

Asked on 02/13/2021 by Tadeus Prastowo

2 answer

Friction in Physics

I've heard a lot of things about Friction like friction between solids, liquids and gases. Even practical applications like motion of objects (Like car moving on road), etc....

Asked on 02/13/2021

4 answer

Can we ignore air resistance?

Is there any case in real life we can get the right (correct) "equations of motion" for object with ignoring air resistance? In any object condition (size or shape...

Asked on 02/13/2021 by mohmmad ALFAIFI

3 answer

Dimension of Dirac $gamma$ matrices

While studying the Dirac equation, I came across this enigmatic passage on p. 551 in From Classical to Quantum Mechanics by G. Esposito, G. Marmo, G. Sudarshan regarding the $gamma$...

Asked on 02/13/2021 by Editortoise-Composerpent

4 answer

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