All Questions
Tagged with uv or electromagnetic-radiation
5,886 questions
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Would reflections make an electromagnetic wave more penetrating into metals?
First i should clarify how i arrived at this question. I understand that in the case of an EM wave reflected off a higher refractive index surface, the reflected electric field vector changes ...
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Does a stationary electron hit by an electromagnetic wave move diagonally?
If a stationary classical electron is hit by an electromagnetic wave, does it move diagonally, since the electric field moves the electron and the magnetic field of the EM wave causes a Lorentz force ...
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Why doesn't the light slow down, even if it loses energy? [duplicate]
The speed of light is roughly 3*$10^{8}$ m/s. Why doesn't the speed change when it bounces off a mirror or gets absorbed by an electron? If you throw a ball in outer space, and it hits a wall, the ...
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Capacitance and propagation delay of straight optical fiber
Computer scientist by trade here, please excuse any bad usage of terminology or overgeneralization.
Today I finally understood how electrical capacitance turns every element of a circuit into a low-...
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Why circulating electron loses energy, as in CPT perspective it is also circulating charge now gaining energy?
While physics is believed to be CPT symmetric in equations, this symmetry is clearly broken in solution we live in, e.g. by entropy growth.
I would like to ask about different asymmetry in solution: ...
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Direct measurement of magnetic field due to displacement current
Maxwell added a term to the Ampere's law based on the claim that a changing electric field is akin to current flowing through a conductor. Because flow of current through a wire produces a magnetic ...
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Additive term to the lagrangian of accelerated charged particles caused by Larmor radiation in classical mechanics
Considering two interacting charged particles $Q_1$ and $Q_2$, the Euler-Lagrange equations are:
$$\dfrac{d}{dt}\dfrac{\partial L_j} {\partial \dot{q_j}}-\dfrac{\partial L_j} {\partial q_j}=0$$
where: ...
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Do photons mediate momentum? [closed]
Question 1: If photons mediate the transfer of electromagnetic forces and most contact we deal with on a day to day basis are electromagnetic forces, is it safe to say that photons mediate momentum?
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How does the usual depiction of an electromagnetic wave fit with depictions as a water style wave? [closed]
For eg. in the 2 slit experiment the interference pattern
is due to a wave like on the surface of water which spreads out radially, and this is the case even with one photon. How does the linear ...
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Computation of the radiation vector
The radiation vector, often called the far-field radiation pattern, is a key quantity that describes the angular distribution and polarization of electromagnetic waves radiated by a source, such as a ...
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What is the relationship between a "single pulsed spherical wave of light," and the "sinuisoidal vacuum" E+M wave eqn. solutions?
This question is purely conceptual and has bugged me for awhile.
When we construct the light cone, we often think about "sending out" a single spherical light wave, sourced by a single pulse ...
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Does electromagnetic energy disappear during a single destructive interference of finite pulses?
I am considering interference between finite electromagnetic pulses, not continuous plane waves.
Pulse 1 travels along the +x direction with a transverse electric field
$$\mathbf{E}_1 = +\hat{\mathbf{...
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How the last two Maxwell equations imply a delay and propagation of changes in $E$ and $B$ rather than instant setting of fields? [duplicate]
How do these Maxwells equations :
$$
\begin{align}
\nabla \times \mathbf{E} &= -\,\frac{\partial \mathbf{B}}{\partial t} \\
\nabla \times \mathbf{B} &= \mu_0 \mathbf{J} + \mu_0 \epsilon_0 \...
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Gamma emission of Ir 172
My question is: given a source of Iridium 172 with a certain activity, what is the distribution of gamma emission, I should expect?
It's pretty straightforward, to find easy decay schemes for some ...
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How can EM waves actually propagate when there is no electric and magnetic fields?
I have read many articles where they say EM waves can propagate in vacuum with no charges and currents, but charges/currents are absent then how can EM field be produced and if EM field itself is ...
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