All Questions
Tagged with electromagnetic-radiation energy
164
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Does the quantisation of energy apply to everything? [duplicate]
Radiation is quantised according to Planck, so that's out of the question. However, I have seen many simplifications that claim Planck introduced quantised energy. Period. Has Planck really done that? ...
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Are gamma rays the limit of the frequency photons can attain, and if yes, why? [duplicate]
Recalling that the Planck constant is $6.62607015 \times 10^{-34} m^2kg/s$ and taking into account the formula $E=hf$, for the energy of photons, we can rapidly derive the energy of gamma rays, which ...
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Isn't the concept of light against law of conservation of energy itself?
Let's say there's a light wave travelling in vacuum, and it travels forever because it does not hit any object in its way. This light ray will produce oscillating magnetic and electric fields, but ...
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Ionizing radiation energy in joules
The energy level at which radiation can be labelled as ionizing is about $10.00-33.85$ eV. This (the $33.85$ eV) is equivalent to $5.423368\cdot 10^{-18}$ Joules. In terms of joules this is a very low ...
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How do you determine the number of ejected electrons based on the photon flux?
If you have a light source with a frequency higher than a materials Electron binding energy, what percent of the photons will eject electrons?
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Time delay between consecutive photon absorptions by atoms/molecules?
We are just getting introduced to some basics of quantum physics at school and in my nationally prescribed school book, its written that:
Planck assumed that radiation could be subdivided into ...
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Is energy rule violated here? [closed]
We know that for an EM radiation , energy is given by :
$$E = \frac{hc}{\lambda}$$
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Where $h$ is Planck's constant , $c = 300000000$m/s and $\lambda$ is wavelength of the radiation.
Clearly, energy ...
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Energy transfer with electromagnetic waves
As we know that the electrical energy is transferred via electromagnetic waves from the source to the load. My question is that, even if there is transfer of energy through the electromagnetic waves, ...
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Which energy is lost by an oscillating charge?
Let us imagine a charged block connected to a fixed spring in gravity free space and in a complete vacuum (to avoid air drag) . Now if an external agent stretches the spring from its natural length ...
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How nucleons get excited? [duplicate]
Gamma rays can be released when nucleons at higher energy states fall down to lower energy states, but how do nucleons get that much high energy to release gamma rays?
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What do we mean by saying light is a form of energy?
"Energy" means "Capability to do work"
We can now write "light is a form of energy" into "light is a form of capability to do work"
Capability can be thought as ...
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How to illustrate that the energy density of EM waves is NOT frequency dependent?
I can technically follow the derivation of the EM energy density expression from Maxwell's equations, as here for example. But it seems really strange that, for waves, it does not depend on frequency....
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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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Upper limit of energy carried by one photon [duplicate]
energy carried by one photon, $E = hυ$ where $υ$ is frequency and $h =$ planck constant. Is there any upper limit to how much energy one photon can carry? or any upper limit of frequency?
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The energy of the photon $hf$, so what is the energy of other masses such as the Earth?
The energy of the photon $hf$, so what is the energy of other masses, and of course I do not mean to write in frequency $f$, what is the relationship of the energy of other masses
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