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tech99's latest activity
tech99
replied to the thread
B
Why 186,282?
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Maxwell noticed that emu and esu units of the cgs system used at that time are related by a constant, which he thought might be c. And...
Wednesday, 12:41 PM
tech99
replied to the thread
B
Why 186,282?
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I think I am right in saying that Maxwell noticed that the electric attraction between two stationary charges is the same as the...
Wednesday, 7:15 AM
tech99
reacted to
Dale's post
in the thread
B
Why 186,282?
with
Like
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And some unit systems don’t even have ##\epsilon_0## or ##\mu_0##.
Tuesday, 4:33 PM
tech99
replied to the thread
I
Does displacement current create a magnetic field? And Lorentz force?
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I would have thought that a current is the movement of charges. There are no charges in a vacuum.
May 10, 2024
tech99
replied to the thread
I
Does displacement current create a magnetic field? And Lorentz force?
.
I am not certain in my own mind if a displacement current is flowing in the case of a radio wave.
May 10, 2024
tech99
replied to the thread
I
Plane wave decomposition of the fields of a dipole antenna
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I think that when you refer to the near field you are referring to the near radiation field (the Fresnel Region), and not the reactive...
May 9, 2024
tech99
replied to the thread
I
Plane wave decomposition of the fields of a dipole antenna
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I can maybe imagine using a sum of spherical waves but not plane waves. The near field you mention is more accurately called the...
May 9, 2024
tech99
replied to the thread
B
Antenna induction, oscillating circuit generating EM Waves
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The mechanism of radiation cannot be explained using the properties of the fields alone. A capacitor which has a vacuum as its...
May 7, 2024
tech99
replied to the thread
B
Antenna induction, oscillating circuit generating EM Waves
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The link provided says the following: "electromagnetic waves-in which an electric field and magnetic field alternately appear-are...
May 6, 2024
tech99
replied to the thread
B
Sound Intensity doubles if number of noise sources double?
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For the sound of the machines to add in amplitude will require them to be in-phase. Even if the machines rotate together, they are still...
May 1, 2024
tech99
replied to the thread
B
Antenna induction, oscillating circuit generating EM Waves
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Every wire has inductance, so the opened out conductors have L and C and still have resonances. The only requirement for an electric...
Apr 27, 2024
tech99
replied to the thread
B
What happens to a photon's energy when it is refracted?
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If the two waves are to be a single quasi-particle, that seems to imply that they travel at the same speed.
Apr 19, 2024
tech99
replied to the thread
B
What happens to a photon's energy when it is refracted?
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I feel that some of the energy of the wave when in the medium is being carried by the motion of electrons and their accompanying fields.
Apr 19, 2024
tech99
replied to the thread
B
What happens to a photon's energy when it is refracted?
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Some of the energy incident on the boundary is reflected, so the refracted energy is less than the incident energy. In quantum terms I...
Apr 16, 2024
tech99
replied to the thread
B
Does a photon's energy change as it refracts?
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Part of the incident energy is reflected when a wave strikes a transparent medium, so I presume that in quantum terms an occasional...
Apr 15, 2024
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