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Physics : Recent Questions and Answers (Page 578)

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

How to (hypothetically) calculate $tau$, the mean free time?

Referring to the Drude Model, I've seen a lot of excellent questions on whether $tau$ should be thought of as the "average time between collisions" or the "average time...

Asked on 02/10/2021

1 answer

Can you take any symplectic 2-form into canonical form via a coordinate transformation?

Let's say we have a system with Hamilton equations begin{equation}dot{Y}^A = Omega^{AB}H_{,B}end{equation}where the coordinates are begin{equation}Y^A=big(q^i,p_jbig)end{equation}where $i=1,dots,N$ and $j=1,dots,N$, ...

Asked on 02/10/2021

0 answer

Why is it that there are sharper Maxima with higher number of slits in a grating

Uff, thats kinda a tricky question to express. But why is it? The intensity-distribution-function looks also complicated so I can't really derive it from the equation. Someone has an intuitive...

Asked on 02/10/2021

1 answer

Why is a vacuum balloon impossible?

According to Can Impossible Vacuum balloon be possible with this idea?, a vacuum balloon is impossible. Why is that?...

Asked on 02/10/2021

1 answer

Relativistic Electromagnetism (Undergrad Level) book with metric $eta_{numu} = (-1, +1, +1, +1)$

I have looked several special relativity books but in each of them the metric is defined as $eta_{numu} = (+1, -1, -1, -1)$. Is there a book where the...

Asked on 02/10/2021

0 answer

Came across a circuit with current flowing from Low to High potential across a resistor (electrons moving from high to low potential)

This is the circuit of small signal analysis for a BJT amplifier. The current shouldn't flow at all. How is it even flowing ? I'm attaching the snap shot of...

Asked on 02/10/2021 by Ayosh Maitra

1 answer

Spontaneous discrete symmetry breaking always implies domain walls

I've read several times that if a discrete symmetry is spontaneously broken, then there exist domain walls that interpolate between the different vacua. However, Weinberg says that if the former...

Asked on 02/10/2021 by Alonso Perez Lona

1 answer

Are any quantities conserved quantities in an expanding universe?

Do we know of any quantities that are conserved on the global scale of the universe? Is there an associated continuous symmetry? I.e. momentum and energy are not globally conserved...

Asked on 02/10/2021 by Robson Christie

0 answer

Can the formula of buoyancy be used in this arrangement?

The buoyant force exerted by an object in water is given by $rho.g.v_{submerged}$ Which only depends on the volume submerged and nothing else(I think) But can it be applied...

Asked on 02/10/2021

1 answer

How can electromagnetic waves reach a cell phone in Faraday cage?

is there any way to make electromagnetic waves reach a cell phone in Faraday cage although conductor surround cell phone everywhere? can we pass current through conductor to make charges...

Asked on 02/10/2021 by Mai Fouad

1 answer

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