This is the first 1,000 characters of 1120 words (4.48 pages) in the essay titled Laser
There are only about 100 different kinds of atoms in the entire universe. Everything we see is made up of these 100 atoms in an unlimited number of combinations. They continuously vibrate, move and rotate. Even the atoms that make up the chairs that we sit in are moving around in class. Atoms can be in “different states of excitation” (Bertolotti 48) or they can have different energies. If we apply a lot of energy to an atom, it can leave what is called the ground-state energy level and go to an excited level. The level of excitation depends on the amount of energy that is applied to the atom by heat, light, or electricity.
An atom consists of a nucleus (containing the protons and neutrons) and an electron cloud. The electrons in this cloud “circle the nucleus in many different orbits” (Bertolotti 51). In other words, if we apply some heat to an atom, we might expect that some of the electrons in the lower energy orbital would shift to higher energy orbitals further away ...
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