Re: Want to prove E=mc²? University labs should try this!

On Sun, 17 Nov 2024 15:42:32 +0000, rhertz wrote:

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On Sun, 17 Nov 2024 5:22:33 +0000, gharnagel wrote:

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On Sun, 17 Nov 2024 4:22:43 +0000, rhertz wrote:

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Not me. Is ChatGPT that indicates that there are no
historical records about experiments of this kind.
Maybe BECAUSE nobody like the results.
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Even when it operates near the limits of technology
available for the last 20 years, the concept itself
is extremely simple to understand and, as ChatGPT
wrote, it's a novel way to prove/disprove E=mc² at
optical level.

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Seems to me that the chatGPT estimate was extremely optimistic.
The maximum energy built up will be limited by the input energy
during each pass of the storage beam.  If the cavity were one
meter long, the time per pass would be 1/c.  How much energy
does a 5 W laser put out during that time? 1.67e-8 J.
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If the end mirror absorbs 0.00001 of the energy per reflection,
the maximum energy in the cavity would reach only .00167 J.
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You might get a 10x improvement of reflectivity and make the
cavity 10 m long, but you're still a long way from your dream,
methinks.  A scales to weigh a 10 meter pipe seems a bit
unwieldy to me.  You think maybe I made a mistake?  Check it
out yourself.

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You are confusing cavity with something else.

"cavity: an unfilled space within a mass, especially: a hollowed-out
space"

I suggest you to read about the cavities used at Berlin University
during 1893-1900 (Wien, Planck - 2 Nobel Prize on the same matter),
and how to measure black body radiation.

I have used such cavities many times to calibrate light sources.
I suggest you reread what I wrote, particularly how many orders of
magnitude a practical system is away from your required energy.

I just thought of the exact opposite use of the small orifice:
to allow the laser beam to ENTER into the perfectly reflecting
cavity, with irregular inner coating, what allow that the laser
beam be dispersed within the small cavity, being confined there.
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The laser beam can't escape,

Actually, it can: through the hole.  1 m diameter ball, 1 mm diameter
hole ==> 0.0001% loss.  Still many orders of magnitude away.  The
light still bounces off the wall of the sphere more often that in
a linear cavity.  But you can probably get up to higher energy in
the ball this way. 5W continuous input would get you to 5 MW,
assuming no losses on the bounces, which is wildly optimistic.

LIGO array use lasers in the kilowatt range, mirrors with almost
100% reflectivity, etc.

"Almost" isn't good enough.  You're still orders of magnitude away
from a practical experiment, which is why no one has attempted one.