# Sensei

Senior Members

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1. ## Electricity questions

It's electrostatics http://en.wikipedia.org/wiki/Electrostatics
2. ## Electricity questions

Charged electroscope metal leafs have abundance of electrons i.e. more electrons than not charged metal. Electrons came from external source of electrons. If you have copper metal plate that has mass m, it has $\frac{m}{m_{Cu}}$ atoms. $m_{Cu}=63.546 u = 1.05521*10^{-25} kg$ mass of single Copper atom. (more info about mass atomic unit http://en.wikipedia.org/wiki/Atomic_mass_unit ) So 1 kg of Copper wire has: $\frac{1 kg }{1.05521*10^{-25} kg}= 9.48*10^{24}$ atoms. and $9.48*10^{24}*29=2.748*10^{26}$ electrons (when it's not charged). They are bound to atoms.
3. ## Electricity questions

Even a lot of electrons. Aluminum has 13 electrons per atom, Iron has 26 electrons per atom, and Copper has 29 electrons per atom. But majority of them don't participate in flow of current through metal.
4. ## Router problems

What is model name? The all wifi routers I was playing with had WAN, WLAN diodes, and 4+ diodes for 4 inputs/outputs. They should blink while transferring data. Do you know how to log-in to your router through web browser? Did you ever do it? Does wifi router appears in wireless neighborhood.. ?
5. ## Applications of Quantum Physics?

Nuclear reactor is application of quantum physics. Magnetic resonance imaging another application of quantum physics. http://en.wikipedia.org/wiki/Magnetic_resonance_imaging 2nd and 3rd generation leptons and quarks and mesons are short living particles, that need tremendous amount of energy to create them in particle accelerator.
6. ## Electricity questions

Electrons from outside source gather on electroscope metal leafs and they're repelling which can be seen and measured. You could have electroscope inside of vacuum tube and it will work fine. How to make electroscope video:

22. ## Fusion vs. Fission and Nuclear Transmutation

See thread, where I am describing it with detail: http://www.scienceforums.net/topic/85656-solar-fusion-neutrinos-and-age-of-solar-system/ Fusion produces a lot of gamma photons. At least from typical input particles (A<4)..
23. ## Fusion vs. Fission and Nuclear Transmutation

Not exactly. Either fusion and fission releases energy. Energy can be in kinetic energy of produced particles, photons, or neutrinos. Details depend on specific input particles. Fusion releases very few energy. Tritium and Deuterium are producing the largest known fusion energy 17.6 MeV per reaction. But Tritium you have to make first. And Deuterium is rare isotope. See example giant planets like Jupiter - they have the same/similar content as Sun at the beginning of its life, but they don't fuse Hydrogen nor Helium.. Why? Because concentration/quantity of these particles in their volume is too small. Fusion reactor needs to create such high density by itself before any fusion will take place. There is need to spend substantial amount of energy before any energy is produced during fusion. Decay of unstable particles happens spontaneously. Nothing is needed to cause it. See thread in my signature to learn more how to calculate energy released during decay of unstable isotopes. And the same calculation can be used to calculate fusion energy. It's done on daily basis. It's the only way Plutonium can be made. If you want to see traces leaved by unstable isotopes that decay see videos below:
24. ## Gasoline Densities

Gasoline is not made of uniform molecules, like f.e. water. Even water is not quite uniform. It can be made of H2O, D2O or HDO, Oxygen can be Oxygen-16, Oxygen-17 or Oxygen-18 isotopes (these are stable). Hydrogen can be Hydrogen-1, Deuterium or Tritium (it has 12.32 years half-life). Heavy water (D2O) won't have the same density (1.11 g/cm^3) as pure water H2O (1 g/cm^3). With gasoline it's much more complicated. Octane C8H18 is one of gasoline components. Different gasolines can have different amount of octanes http://en.wikipedia.org/wiki/Octane_rating
25. ## Would proton decay allow for black holes?

Hawking radiation is based on original Dirac idea that particle has positive mass (and positive energy), and its antiparticle has negative mass (and negative energy). But it has been experimentally confirmed that antiparticles have positive mass (thus positive energy). Annihilation of electron and positron is example of this process. Gamma photons produced by it, doesn't have negative energy.
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