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Newsgroups: sci.physics.relativity
Subject: Re: The HOAX of E=mc?. Documented history since 1898.
From: nospam@de-ster.demon.nl (J. J. Lodder)
Reply-To: jjlxa31@xs4all.nl (J. J. Lodder)
Date: Wed, 13 Nov 2024 23:26:34 +0100
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rhertz <hertz778@gmail.com> wrote:

> That there was a relationship between energy and mass was suspected
> since the last years of XIX century.
> 
> By 1899, Poincaré derived such a relationship by using a thought
> experiment with a "light cannon" and its recoil, once it shot a pulse of
> light. By equating the energy of the light pulse and the recoil of such
> a cannon, it lead him to attribute to electromagnetic radiation a mass
> equal to E/c? where E is the total energy of the radiation.
> 
> https://www.bjp-bg.com/papers/bjp2019_2_081-093.pdf

There you go again, clueless as usual.
Maxwell himself already predicted radiation pressure,
and he knew that EM fields must have energy.
Again, 'everyone' knew that in the late 19th century.
It was used extensively to extend thermodynamics
to include EM fields.
Maxwell was hardly original in this.
Kepler already postullated radiation pressure,
from the observation of comet tails being blown away from the sun,
but he could not quantify it.
Lebedev confirmed Maxwell's prediction quantitatively in 1900.
Poincare's thought experiment is merely a demonstration,

Jan