Recent content by Wallis
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Undergrad How does observation affect reality
Feynman's explanation of how mirrors work is a delight. (As I remember it, in Six Not So Easy Pieces, but please correct me.) But back to the topic, I claim observation cannot possibly affect reality. Only the transfer of energy from one place to another affects reality. There you have it...- Wallis
- Post #49
- Forum: Quantum Physics
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Undergrad How does observation affect reality
An excited atom emits a photon and the electron descends to a lower orbital, removing energy from the atom into the photon (or it's wave function.) This energy is stored in the wave function of the photon (for where else can it reside as the wave function spreads out and evolves over time?)...- Wallis
- Post #33
- Forum: Quantum Physics
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Undergrad How does observation affect reality
Momentum direction? Really? That's just energy. Do the maths. Momentum in one direction is energy. To convert it to another direction involves a change in energy. This is energy. Consider the electron traveling in one direction, receiving a photon. Boom. Energy.- Wallis
- Post #25
- Forum: Quantum Physics
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Is this zero backlash or am I missing something?
Preloading the gears (springs) will always stop backlash unless the load exceeds the tension of the springs when erratic backlash will occur. Make sure your gear profiles are correct otherwise the mechanical noise (perturbations) involved in the mesh will greatly reduce any benefits of removing...- Wallis
- Post #4
- Forum: Mechanical Engineering
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Undergrad How does observation affect reality
People get hived off into separate subjects and forget the basics. For the conservation of energy to be a consistent and whole paradigm, the collapse of the wave function is necessarily governed by/coalesces with the transfer of energy, otherwise, there would be no rules; there would be no...- Wallis
- Post #23
- Forum: Quantum Physics
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Graduate Let's Sort Out This Gravity Thing - c And All That
I seem to need books. It seems, from what Peter says, that neither the "field" escapes, nor the "changes in the field" escape. So, nothing escapes, but "everything we need is conveniently frozen in extreme time-dilation at the Scwartzschild radius." I need a book that can explain how this...- Wallis
- Post #8
- Forum: Special and General Relativity
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Graduate Let's Sort Out This Gravity Thing - c And All That
Peter's reference quotes a source that says gravitons probably don't exist in this form owing to the classic "infinity of infinities" causing the inability to renormalise-around singularities in graviton theory, so maybe the whole thing is not a suitable topic (yet) for the forums. Are there...- Wallis
- Post #4
- Forum: Special and General Relativity
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Graduate Let's Sort Out This Gravity Thing - c And All That
"General relativity predicts that disturbances in the gravitational field propagate as gravitational waves, and that low-amplitude gravitational waves travel at the speed of light." It seems high energy waves may travel slower, but certainly not faster. So, a large star whilst going supernova...- Wallis
- Thread
- Gravitons Gravity Sort
- Replies: 14
- Forum: Special and General Relativity
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Graduate How Do Scientists Use Zircons to Date the Earth's Formation?
Nah, It's OK. We all get confused. The original question was... If everything earliest on Earth is 4.5 bn years old, surely this is the age of the supernova that made the elements the Earth is composed of (certainly younger than 13bn since the solar system is supposedly composed of 3rd... -
High School What are the meanings of cm^2 and cm^3 in the metric system?
I think you mean box, not square...?- Wallis
- Post #3
- Forum: Other Physics Topics
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Graduate How Do Scientists Use Zircons to Date the Earth's Formation?
Thanks Chalnoth; do not frett, I am saying this thread is closed. The possibility that worried me in my initial assertion - is resolved in the information on the ambiguities in reporting radiometric-dating. In not including the closure date and the reasons why daughter nuclides would be... -
Graduate How Do Scientists Use Zircons to Date the Earth's Formation?
Okay, so closure temperature is a new concept to me. However, the relevant section in the article begins with a big IF. "If a material that selectively rejects the daughter nuclide is heated, any daughter nuclides that have been accumulated over time will be lost through diffusion, setting the... -
Graduate How Do Scientists Use Zircons to Date the Earth's Formation?
Is it that the accretion and planetary formation process involved remaking all the elements of the early Earth? Phinds, please embarrass me if you will. I cannot see another way. Are there really not enough red giants around Chalnoth? They could produce all the end products required and in... -
Graduate Can Gravitons Convey Information Faster Than Light?
Thank you DrChinese, I see there are changes afoot. I was swayed like the reed as they say. Last time I posted quoting black holes, I was told off for positing black holes on the forum as they were purely conjectural. So, having exposed the graviton as not so good a candidate for gravity...- Wallis
- Post #12
- Forum: Quantum Physics
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Graduate Can Gravitons Convey Information Faster Than Light?
Thanks All, I see that although black holes have been observed (9 or is it 11 now) at the Milky Way galactic centre, this forum still does not officially accept they exist. If they were to exist, then yes, it would prove gravitons have a very hard time indeed existing. Thanks for the...- Wallis
- Post #10
- Forum: Quantum Physics