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Physics : Recent Questions and Answers (Page 243)

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

Where do we get our sense of perpendicularity?

We all have an innate sense of perpendicularity. I know, for example, that if I make a T-pose then the direction of my arms and the direction of where my...

Asked on 06/22/2021

2 answer

Phase/Intensity uncertainty relation

In quantum optic, we have the relationship: $$Delta NDelta theta>1/2tag 1$$ But to my knowledge, $thetain[0,2pi[$ so $Deltatheta$ is finite, then for example if we know perfectly...

Asked on 06/22/2021

1 answer

Time evolution operator

$renewcommand{ket}[1]{left lvert #1 rightrangle}$$renewcommand{bra}[1]{left langle #1 rightrvert}$I start with this expression for the Hamiltonian:$$H = a left(ket{1} bra{1} - ket{2}bra{2} -i ket{1}bra{2} + i...

Asked on 06/22/2021

1 answer

Calculate Retinal irradiance (W/cm² to log photons/cm²/s)

I have been trying to calculate what retinal irradiance value I get with a 1 blue LED system. Since the manufacturer didn´t give the spectral distribution information, I will approximate...

Asked on 06/22/2021 by az_

1 answer

Have any of the new predictions made by LQG been experimentally verified?

A wikipedia template lists under the heading "fully compatible with observation": Einstein-Cartan theory, Gauge theory gravity, Teleparalleism and...

Asked on 06/22/2021 by Abhimanyu Pallavi Sudhir

3 answer

What is the spatial extent of single photon?

By the uncertainty principle particles cannot be specified in space and momentum simultaneously in the copenhagen interpretation of quantum mechanics. If photons are moving with c in every posible frame...

Asked on 06/22/2021

4 answer

Graduate level introduction for Lieb-Robinson Bounds?

I've recently become interested in Lieb-Robinson Bounds [$1$] [$2$] Where can I learn more about the Lieb-Robinson Bounds? I am hoping for some graduate level introduction...

Asked on 06/22/2021

1 answer

Why do we say that at boiling point liquid and vapour exist in equilibrium?

I understand that at boiling point, vapour pressure becomes equal to the external pressure. But in my textbook it is written that at boiling point liquid and vapour exist in...

Asked on 06/22/2021

1 answer

Gravitational potential energy sign

Following is a small derivation just so I can explain my question. The gravitational potential energy is: $$(*)U_g = -frac{GMm}{r}$$ And: $$ Delta U =-GMm(frac{1}{r_{final}} - frac{1}{r_{initial}}) $$...

Asked on 06/22/2021

1 answer

Why have we assume that the there should be no acceleration in deriving the Electrostatic potential energy

In the NCERT textbook grade 12, it is mentioned before deriving the work done in moving a charge $q$ from point $R$ to $P$ in presence of...

Asked on 06/22/2021

1 answer

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