一道英文的物理题When a proton captures an electron,a photon with anenergy of 13.6 eV is emitted.What is the frequency of thisphoton?Does it lie in,above,or below the visible range?答案 当一个质子捕获一个电子时,会发射出一个具有13.6电子伏能量的光子,请问这个光子的频率是多少?它是否在可见光...
When we think of particle physics, James Joyce isn’t usually the first name that springs to mind. And Joyce wasn’t on the mind of physicist Murray Gell-Man in 1963, when he proposed a name for his concept of an elementary particle of matter that is smaller than a proton or a neutro...
The Oh-My-God particle is probably a proton, or at least proton-like — fairly massive on the scale of subatomic particles. A neutrino's mass is at least 10 billion times smaller than a proton's, so thanks to the basic laws of physics, it can travel even faster if given the same ...
α For ο Cet 35 Ari γ Tri ξ Per The ___ is responsible for binding the electrons to the nucleus. Kirchhoff's law ground state temperature Coulomb force Balmer series ___ has a negative charge and a mass about 1800 times smaller than a proton. A neutron An electron A molecule A nu...
(weakly interacting massive particles), which are thought to be ten to a hundred times the mass of a proton. However, their weak interactions with "normal" matter make them challenging to detect. Among these, neutralinos — hypothetical particles that are heavier and slower than neutrinos — ...
TheAtomic Number (Z)is sometimes called the 'Proton Number'. The Mass Number of an atom: ... is the total number of protons and neutrons in the atom. It is sometimes represented by the symbol 'A'. TheMass Number (A)is sometimes called the 'Nucleon Number'. ...
example, in 1991, an ultra-high-energy cosmic ray, now known as the OMG particle, hit a detector in Utah with the kinetic energy of a 63 mph fastball. Most cosmic rays are protons, and to have had that kind of energy, a proton would have had to be traveling at more than ...
What is an electron? Electrons are tiny compared to protons and neutrons, over 1,800 times smaller than either a proton or a neutron. Electrons are about 0.054% as massive as neutrons, according to Jefferson Lab. Joseph John (J.J.) Thomson, a British physicist, discovered the electron in...
故选C 项。 C A proton(质子) is an infinitesimal(无穷小的) part of an atom. Now imagine if you can (and of course you can't) make smaller one of those protons down to a billionth of its normal size into a space so small that it would make a proton look huge. Now pack into ...
On my screen, each of the atomic red dots is about 10 million times bigger than a typical atom. (Your screen may be bigger or smaller than mine, or scaled differently, so take that as a very rough approximation.)Sponsored linksContents What is an atom? What are the parts of an atom?