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Janez
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For light it is said it has no volume and also it it waves of electric and magnetic field. But for electric and magnetic field you need space? So can they both be at the same time?
Where specifically is that said? please provide an exact referenceJanez said:For light it is said it has no volume
It depends what you mean by that. What sort of experiment are you thinking of? Or what quantity would you accept as being the volume of light.Janez said:Could we measure volume of light?
Light means waves in electromagnetic field. You need to define spatial boundaries of a wave, to determine its volume.Janez said:For light it is said it has no volume and also it it waves of electric and magnetic field. But for electric and magnetic field you need space? So can they both be at the same time?
olgerm said:Light means waves in electromagnetic field.
olgerm said:You need to define spatial boundaries of a wave, to determine its volume.
olgerm said:Similarily it would be hard to determine volume of sound(soundwaves) or surfacearea of waterwaves.
Light is quantized as photons but this quantification is a representation of an amount of energy, not a representation of an amount of matter or mass, photons are considered "mass-less", meaning, they are not made of a substantial material that occupies space. They are not made of an amount of physical material. If they were, that material could be measured and given a mass, weight and volume.Janez said:Could we measure volume of light?
Droidriven said:They are not made of an amount of physical material. If they were, that material could be measured and given a mass
Droidriven said:but this quantification is a representation of an amount of energy, not a representation of an amount of matter or mass, photons are considered "mass-less", meaning, they are not made of a substantial material that occupies space.
weirdoguy said:System of at least two photons have non-zero mass so your reasoning is flawed.
1. Define "substantial material".
2. Energy is a property of particles/systems, not a particle (or whatever) itself. Photons also have momentum, so why do people seem to focus so much on the energy part and neglect other things? And it's always in a spirit like if massive particles didn't have energy...
Yes. Mass is the norm of the four-momentum. So the norm of a sum of four-vectors is greater than the sum of the norms of the original four-vectors. This is the four-vector equivalent of the triangle inequalityDroidriven said:So, two or more particles with zero mass have a combined total of greater than zero mass?
It is a different mathematical object. Mass is the norm of a four-vector, so it doesn’t add like a real number.Droidriven said:How is this an exception to the mathematical principle of 0+0=0?
No.Droidriven said:isn't momentum also energy?
Stephenk53 said:Couldn’t you say that the light from let’s say a flashlight traveled a distance of d in say t time, and spread out into a cone shape taking up a volume of v space traveled in t time. Also in this case I assume that the flashlight stayed on and thus the light “takes up” that volume since if you stand anywhere in that volume of space you would see the light.
Yes, electric and magnetic fields can coexist in the same space. In fact, they are often found together and are closely related to each other.
Electric and magnetic fields can interact with each other through a phenomenon called electromagnetic induction. This occurs when a changing magnetic field induces an electric field, or when a changing electric field induces a magnetic field.
There is no conclusive evidence that electric and magnetic fields are harmful to humans. However, exposure to high levels of these fields can cause some health effects, such as heating of tissues or interference with pacemakers.
Yes, electric and magnetic fields can cancel each other out. This is known as destructive interference and occurs when two waves with equal amplitude and opposite phases meet.
Electric and magnetic fields are measured using specialized instruments such as voltmeters, ammeters, and gaussmeters. These instruments measure the strength and direction of the fields, and the units of measurement are volts per meter (V/m) for electric fields and teslas (T) for magnetic fields.