Hydrogen is the smallest atom of all the known elements. A neutral hydrogen atom, meaning one that does not have a positive or a neutral charge, is composed of a single proton and a single electron. There are no neutrons in a typical hydrogen atom though some isotopes of hydrogen may ...
What is the velocity of an alpha-particle (a helium nucleus) that has a de Broglie wavelength of 0.529 A?What would be the de Broglie wavelength of a helium atom (atomic weight = 4.00 g/mol) moving at 100 m/s?A helium atom is ...
知道速度求波长The average speed of a helium atom at 25°C is 1.23 103 m·s-1.What is the average wavelength of a helium atom at this temperature? 答案 一个氦原子质量为0.664x10^(-26)kg根据德布罗意波长公式可得λ=h/p=h/(mv)=8.113×10^(-11)m相关推荐 1知道速度求波长The average ...
Since the beginning of time, human beings have sought to understand what the universe and everything within it is made up of. And while ancient magi and philosophers conceived of a world composed of four or five elements – earth, air, water, fire (and metal, or consciousness) – by clas...
Protons and neutrons have approximately the same mass. However, one proton is about 1,835 times more massive than an electron. Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. Adding a proton to an atom makes ...
A hydrogen atom is composed of two fermions - a proton and an electron - both having spin-1/2. So, we get two spin configurations: Parallel configuration, that is, the total spin is 1 Anti-parallel configuration, that is, the total spin is 0 ...
This kind of particle is tantamount to the nucleus of a helium (He) atoms. Helium is the second element on the periodic table, and with an atomic mass of 4.00, it has two protons and two neutrons. The entire atom also has two electrons that balance out the charge of the two protons...
Planetary Nebulae involves a low-mass star entering the final stage of its life. This is called theRed Giantphase, where the star slowly loses its outer layers due to helium flashes from their interior. When the star has lost enough material its temperature increases. In turn, the UV radiati...
Four atoms of hydrogen can combine to make one atom of helium, admittedly by a rather roundabout route. Every time one helium atom is formed, a little mass is lost and a little energy is released. It is this energy that makes the stars shine; the loss of mass amounts to a staggering...
Since the beginning of time, human beings have sought to understand what the universe and everything within it is made up of. And while ancient magi and philosophers conceived of a world composed of four or five elements – earth, air, water, fire (and metal, or consciousness) – by clas...