百度试题 结果1 题目3 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? B A 21 B 24 C. 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
百度试题 结果1 题目5 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
How is nuclear stability related to the neutron proton ratio? Where are an atom?s neutrons are found? What are isotopes in nuclear physics? How does a linear accelerator produce neutrons? How are protons and neutrons similar? How does an atom/nucleus change during a nuclear process?
When a photon hits a phosphor atom, one of the phosphor's electrons jumps to a higher energy level, causing the atom to vibrate and create heat. When the electron falls back to its normal level, it releases energy in the form of another photon. This photon has less energy than the ...
Choosing the right color for your sunglasses lets them work better in specific situations. When you buy a pair of cheap sunglasses, you often give up all of these benefits and can even make things worse. For example, if your sunglasses offer no UV protection, you increase your exposure to ...
For electrons to break free of atoms, they need to absorb photons, the particles of electromagnetic radiation, with a certain amount of energy, the "ionization energy." This energy is different depending on what "shell" around an atom the electron occupies. Electrons on the outer shell are th...
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Mass of isotopes Isotopes containing more neutrons have a greater mass. 具有相同质子数不同中子数的原子互为同位素。中子数多的同位素质量更大。 In spite of these differences, isotopes of an atom have the ...
Fire a neutron at uranium-235 and you turn it into uranium-236: an unstable version of the same atom (a radioactive isotope of uranium) with 92 protons and 144 neutrons (remember that you fired an extra one in). Uranium-236 is too unstable to hang around for long so it splits apart...
However, a camera's lens focuses light, while the lenses used in holography cause the beam to spread out. A beam splitter: This is a device that uses mirrors and prisms to split one beam of light into two beams. Mirrors: These direct the beams of light to the correct locations. Along...
Choosing the right color for your sunglasses lets them work better in specific situations. When you buy a pair of cheap sunglasses, you often give up all of these benefits and can even make things worse. For example, if your sunglasses offer no UV protection, you increase your exposure to ...