It is a single computer in a network reserved for serving the needs of the network.

The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.

Most stars are at main sequence point in their life cycles.

Capitalism is an economic system in which private entities or businesses own capital goods.

Gasoline is a colorless petroleum-derived flammable liquid that is used primarily as a fuel in spark-ignited internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. It is also called as Petrol. It has chemical potential energy, in combustion it is turned into light, sound, heat and kinetic energy.

Archetypes were models of people, behaviors, or personalities. They were inborn tendencies that play a role in influencing human behavior.

For example: A hero, an innocent, the villain, the mentor, etc...

1. The mentor is a common archetype in literature. The mentor is usually old, and this person often has some kind of magical abilities or a much greater breadth of knowledge than others possess.

2. Characters representing the innocent archetype are often women or children. These character archetypes are pure in every way.

3. The villain wants to stop the hero archetype from achieving his or her goal. The villain is often evil, though there is often a reason—however warped that reason may be—why villains are so bad. Villains often want nothing more than to control and have power over everyone and everything around them.

The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.

The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.