Is General Relativity Exclusively a Macroscopic Theory? - Physics …
2004年11月23日 · Macroscopic observations involve using our senses to gather information about objects or phenomena that are visible to the naked eye. Microscopic observations, on the other hand, require the use of specialized equipment, such as microscopes, to gather information about objects or phenomena that are too small to be seen with the naked eye.
The difference between microscopic and macroscopic cross sections.
2010年10月31日 · The macroscopic cross-section (Σ) has units of cm-1 is derived from the microscopic section according to Σ = N σ, where N is the atomic density of a particular nuclide. The reaction rate for a give interaction = Σ Φ , where Φ is the neutron flux.
Microscopic and macroscopic physics - Physics Forums
2020年8月13日 · Microscopic and macroscopic physics are interconnected and complement each other. Macroscopic properties and behaviors of matter are a result of the interactions and behaviors of microscopic particles. Understanding the microscopic world helps us explain and predict macroscopic phenomena.
Calculation of neutron transport cross section - Physics Forums
2013年7月12日 · The transport cross sections for water and heavy water are 0.45cm and 2.6cm. These values can be calculated using the equation macroscopic cross section = 1/mean free path, or specifically for water, 1-cos(theta) = 0.324, and for heavy water, 1-cos(theta) = 0.116. However, these values may differ from those in the cited text.
Macroscopic object wave function - Physics Forums
2020年1月15日 · The macroscopic object wave function is derived from the Schrödinger equation, which is a fundamental equation in quantum mechanics. The equation describes the evolution of the wave function over time and can be used to calculate the probability of finding a macroscopic object in a particular state.
If we wait infinitely long, will macroscopic objects undergo …
2023年8月30日 · The idea that a macroscopic object like a chair must tunnel an equivalent distance relative to its size is misguided. Each individual atom has almost zero probability of tunneling several metres. Last edited: Sep 1, 2023
The Density of a Nucleus: A Question About Steps in Calculating …
2019年7月20日 · There is relatively little empty space between atoms in solids and liquids, so that the average density of an atom is about the same as matter on a macroscopic scale—approximately 10^3 kg/m^3 . The nucleus of an atom has a radius about 10^-5 that of the atom and contains nearly all the mass of the entire atom.
The 7 Basic Rules of Quantum Mechanics - Physics Forums
2019年5月11日 · A related problem, the problem of the emergence of a classical macroscopic world from the microscopic quantum description, is often considered as essentially solved by decoherence. To solve the measurement problem, other interpretations of quantum formalism or theories have been proposed.
Why You Can’t Quantum Tunnel Through a Wall - Physics Forums
2015年8月10日 · I simply did not want this to go over the heads of people who haven't even done undergraduate QM classes, but I wanted to point out that many people who talk about macroscopic objects tunneling through a barrier are ignoring the FACT that composite particle/macroscopic object tunneling is extremely different and extremely complicated with ...
Does Decoherence get rid of all Quantumness? - Physics Forums
2020年7月29日 · Here, we have extended the macroscopic system “Alice” of the conventional proposals to an even larger macroscopic system Aa (that is, Alice plus the qubit a). This effectively debilitates the decoherence mechanism’s ability to reach “classicality”, since it only leads to a loss of coherence between Alice and the microscopic subsystems.