Questions tagged [electromagnetic-radiation]
Propagating solutions to Maxwell’s equations in classical electromagnetism and real photons in quantum electrodynamics. A superset of thermal-radiation.
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Can we catch signals from a cellphone using an external device? [closed]
What if someone stole em waves from our mobile devices to listen to our conversations or get our OTP. Whatever encryptions they have they are just EM waves innit and they cannot be propagated only in ...
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Can I describe whole Electromagnetism only with electric field $\vec{E}$?
Is it possible to write all Maxwell's equations only in terms of $\vec{E}$ (without $\vec{B}$)? The common formulation of Electromagnetism is governed by the equations below:
The Lorentz Force: $$\vec{...
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Gamma Photons vs. Muons; Which is more expensive [closed]
Which one takes more energy to produce?
I ask as I theorize that keeping the plasma in a fusion reactor is very expensive.
Muons, while useful, are too short lived.
Maybe... Keeping the plasma at ...
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How much photons are needed to erase a complete mountain? [closed]
I've heard that light does change our momentum a little bit which made me think: How much photons are needed to erase a complete mountain? That is to evaporate a complete mountain such as Himalaya for ...
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Planck's quantum theory
Recently came across Planck's theory, $E = h\nu$.
It means that at any frequency, there is given energy. But I also saw that, $E$ can be $0, h\nu, 2h\nu, 3h\nu,...$.
How is it possible that energy can ...
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What is the brightest light? [closed]
I have been to wikipedia about intensity of light, and there are at least 20 different ways to classify it. So I guess it boils down to the formula E = hf, which is the energy of a single photon. Now ...
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Is LTE radiation stronger when there is no reception [closed]
I am connecting to the internet with the tethering option on my phone.
I wonder if the LTE radiation is stronger when there is no connection.
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home made atom destruction unit [closed]
Today we learnt at school that atoms can be destructed. I believe Physics is a great science to do experiment and I would like to try it at home. Could you tell me what I need to do it? and is it ...
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Is there an IR-camera-detectible color that can be the coat for a material to transfer the material heat by emitting into the space? [closed]
If we see a material it is coloured in a color that our brain could easly recognize. But when we look at it by the help of an IR camera it could also be coloured and if two materials have same ...
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Does accelerating ice produce electromagnetic radiation?
There are at least two parts in this question. First one is does the interior of the ice produce radiation when it is accelerated? I guess it does not "because it is electrically neutral". ...
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Is there a link between nuclear radiation and sound? [closed]
I'd like to understand if it's possible to relate/imagine a link or relationship between nuclear radiation and sound. A simple description would be appreciated since I don't have a deep understanding ...
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Does the fact that light (photons) are bent by a sufficiently big mass prove that a quantum theory of gravity doesn't exist?
As is proven, light can be bent by a heavy mass in the context of classical General Relativity. In a quantum theory of gravity, the gravity field around a heavy mass consists of a condensate of (...
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Why the shape of dish antenna is in parabolic shape? [closed]
All dish antenna are in the shape of parabola. Is the curve of parabola anyhow related to physical quantity of the wave of transmission? Are there different curved antennas for different waves?
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How can light carry data if light has no mass, and data has mass? [closed]
Via a packet-switched network, like the internet, data is sent as packets (bits) wirelessly via radio waves with Wi-Fi, or 802.11g, etc.
What my question is is this:
Radio waves are light; light has ...
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Light Energy Absorption In Mirror
Let the amount of energy in one pulse of (laser) light be $E$, and the wavelength be $\lambda$.
This pulse goes straight to the mirror, and it is reflected by the mirror.
Let the reflectivity of ...
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