conditions for wave to exist/propogate

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conditions for wave to exist/propogate

Post by knight47 on Thu Aug 18, 2016 6:20 pm

do waves have to exist in something?

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Re: conditions for wave to exist/propogate

Post by The Confused Guy (O.o)? on Thu Aug 18, 2016 6:23 pm

infact it needs nothing
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Re: conditions for wave to exist/propogate

Post by Sreejith A Nair on Thu Aug 18, 2016 8:34 pm

Actually anything varying in sinusoidal form with respect to time and position can constitute a wave; a=A×sin (kx-wt+d).

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Re: conditions for wave to exist/propogate

Post by bsms2016 on Sun Aug 21, 2016 9:04 pm

Mechanical waves need a medium to exist. But Electromagnetic waves are caused by variations in Electric and Magnetic fields so they dont need a medium.
www.acs.psu.edu/drussell/Demos/waves/wavemotion.htm

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Re: conditions for wave to exist/propogate

Post by The Confused Guy (O.o)? on Sun Aug 21, 2016 9:05 pm

the link u sent is unavailable
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Re: conditions for wave to exist/propogate

Post by bsms2016 on Sun Aug 21, 2016 9:09 pm


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Re: conditions for wave to exist/propogate

Post by Sabiya on Tue Aug 23, 2016 1:41 pm

Similarly the wave that describes an electron (the Schrödinger wavefunction/wave equation) also does not need a medium to exist simply because electrons don't need a medium to exist themselves
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Re: conditions for wave to exist/propogate

Post by Jackal on Wed Aug 24, 2016 1:42 pm

I think that this definition of wave is stronger? Waves are actually transmission disturbances or energy through matter or not through it but without the displacement of matter itself. This means that waves could have any graphical representation if it is a function of the form f(kx-wt)=f(x,t). This function could take the form of an exponential function, a straight line or any other one too but must depend on these parameters and be able to express it in terms of sine or cosine function summation(which we know can be done with fourier series-as it can express any graph).

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Re: conditions for wave to exist/propogate

Post by Jarvis.Hex on Fri Aug 26, 2016 4:07 pm

"Sabiya", do not consider electron as a wave or a particle, actually its neither. In fact, some of electron's properties (/behaviour) can be described by considering it a wave and some by considering it a particle. Electron is "electron", neither a wave nor a particle. So the wave that describes electron is not real wave like EM wave but a probability distribution (/probability wave) which is an abstract concept, so the questions like "does it exist?" makes no sense.

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Re: conditions for wave to exist/propogate

Post by Dinesh PR on Fri Aug 26, 2016 4:26 pm

Guys, what is that you actually mean by no medium? Is that a vaccum? Here's something interesting. There's nothing like 'vaccum'. Refer the quantum fields theory and GR. Space-time is an object and there's always energy content (simply 'particles') in it, since there are always fields corresponding to them. For each field, there's a rival (like position and momentum in uncertainty principle). Take electric and magnetic field. If electric field tries to be zero, magnetic field doesn't let it to be. Similarly electrons need something called Higgs field for them to have mass. For charge, I don't know. So I strongly disagree with the claim that the wave function of electrons don't need 'medium'.

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