Recent content by Spinnor

Again consider the electric fields surrounding an antenna at an instant of time. We know that an antenna emits energy, suppose the energy is in the form of a very large but finite number of particles which move away from the antenna at the speed of light. Google "how many photons does a...

I am having trouble coming up with a clear answer so will have to think a bit more. Thanks.

"To this author, there is very limited physical reality to the inhomogeneous plane waves [describing the near field] identified in the expansions (41)-(43)." I read that part. He comes up with an expansion for the Hertzian dipole in terms of plane waves that are equivalent to the fields of the...

I am sure you would understand the paper I linked. I think my question is answered? The fields of a Hertzian antenna can be decomposed into an infinite sum of plane wave that give both the near and far fields? Is it hard, looks like it. Why Professor Kirk T. McDonald would solve this problem I...

This paper may also help, buy allowing the wave vector to be complex we can get near fields? Thanks for your help. http://kirkmcd.princeton.edu/examples/virtual.pdf Section 2.5 covers the Oscillating Electric Dipole.

Consider the electric and magnetic fields around a dipole antenna, Suppose these fields represent some type of curvature in space and time. Suppose where the fields are strong we have greater curvature. Also suppose these fields are really some very large but finite sum of "moving local...

A dipole antenna will have near fields and far fields. Can both the near and far fields can be decomposed into an infinite sum of plane waves? If so, are the plane waves for far fields and near fields of different type or class? Near fields must die off at infinity but far fields do not. Thanks.

I don't think I read the text. The picture of the capacitor morphing into an antenna forces you to also imagine how the displacement current also changes. For some poor reason I think that I thought that only between the charging capacitor plates is where you found the displacement current, not...

The last image you included in your post is interesting, could you post the source of that image or the text that went with the image. A similar graphic appears in, https://global.canon/en/technology/s_labo/light/001/11.html Thanks.

Most real bodies are not black bodies. See this thread, Getting the emissivity from scratch , https://www.physicsforums.com/threads/getting-the-emissivity-from-scratch.972255/#:~:text=2.,the%20emissivity%20can%20be%20determined. Material Emissivity Human Skin 0.98 Water 0.95 Aluminum...

The black disc looks to be near Raleigh N.C. and a Google search "what is going on in raleigh north carolina this weekend" came up with Dreamville Festival among other things to do.

From, https://www.axios.com/2024/04/05/airbnb-bookings-eclipse-april-8-map

I took a quick look and wonder if and how the papers you linked would explain the simple quantum problem of a particle in a 1-D box? Thank you.

All the work should be able to be done outside of the house. If you were lucky enough to shoot for the rim joist that is a large target, house studs a smaller target. The links show work from the outside. Do some research and then talk to your inspector he could potentially save you a bunch of...

You only should need max 1/2 inch holes which a hammer drill will do effortlessly through brick. If you look at the link I included going through brick is shown and only small holes are made. If the brick would need to be removed that would be a deal breaker for me. Your friendly local code...