Recent content by Dante Meira

Thank you. As a curiosity, an article named "The Effect of Change of Temperature on the Velocity of Sound in Iron" was published in Nature magazine on 22 April 1886: https://www.nature.com/articles/033582b0

Is there a formula to calculate the speed of propagation of sound waves through steel (a steel bar, for example) according to the temperature of steel?

If the refractive index in that page is "Beta", then the refractive index of Hg (mercury) for hard X-rays of 10keV is 1.6054 ?

Thank you. I checked the data there for Hg (mercury) but I didn't know how to use the data to calculate the speed of propagation of X-rays. But I did find this other website: https://refractiveindex.info/?shelf=main&book=Hg&page=Inagaki There I could check the refractive index of Hg for...

I could find some approximations in a Google search about the speed of visible light in distilled water, but couldn't find much about the speed of X-rays in liquid mercury. In which medium electromagnetic waves travel faster, distilled water or liquid mercury? Does the wavelength of the...

No my friend, I'm not bothering anyone asking to test anything... I have tested it myself with neodymium magnets. And my idea was correct. But neodymium magnets are expensive toys, even more now after the supply chain shock from the pandemic. I'm just sharing with others the idea that those...

It will be easier to test that idea to its limits when iron nitride permanent magnets like those described in the following link are commercially available: https://hackaday.com/2022/09/01/iron-nitrides-powerful-magnets-without-the-rare-earth-elements/ Cheaper and stronger than neodymium...

I'm not sure if there would be any point after all... I was just curious to know if it would be possible to do. Thank your for clarifying that.

A superconductor with little or no magnetic field within it is said to be in the Meissner state. The Meissner state breaks down when the applied magnetic field is too strong. But what happens if an electromagnet that is at first "turned off" is suddenly "turned on", in the close proximity of a...

Basic level thread here. If gravity "bends" the spacetime continuum, do a strong permanent magnet bend spacetime too? I'm no physicist, I'm layman, and I just don't know how this "bending" of spacetime works when a Jumbo jet is in free fall from 10 thousand meters high, pulled by Earth's...

Thank you for clarifying that. I'm just really curious to know which would be the requirements for performing the double-slit experiment with VHF photons, or photon with even bigger wavelengths.

How should I interpret the size of the dots in the plate used in the double-slit experiment with photons? What will determine the size of the dots in the plate? The energy level of the photon has no relation to it?

Well, I don't know how to measure it... I was just imagining that if you try to do the double-slit experiment with VHF photons you got to use really huge slits...

I read that electromagnetic radiation behaves both as particle and as wave, in what is called wave–particle duality. Given that the radio waves of VHF television have wavelengths from one to ten meters, what is the size of a "VHF photon"?

I formulated a statement about the repulsion between a permanent magnet and an air core coil (electromagnets without a ferromagnetic or ferrimagnetic core), and I believe this statement is true, but I would like to seek the opinion of others about it: "In a system where an electromagnet made...