PHY 2020 Chapter Notes - Chapter 11: Positron, Weighted Arithmetic Mean, Radiant Energy
Document Summary
Chapter 11 notes- the atomic nature of matter. An english meteorologist and schoolteacher, john dalton, revived the atomic idea in the early 1800s: he successfully explained the nature of chemical reaction by proposing that all matter is made of atoms. Atoms: the smallest particle of an element that has all the element"s chemical. Brownian motion: results from collisions between visible particles and properties invisible atoms. Figure 11. 1: an early-20th-century model of the atom, with a central nucleus and orbiting electrons, much like a solar system with orbiting planets. Checkpoint 1: (1) which are older: the atoms in the body of an elderly person or those in the body of a baby (cid:523)(cid:884)(cid:524) the world"s population grows each year. Most of atoms were manufactured in stars that exploded before the solar system came into existence: (2)the greater number of people increases the mass of earth by zero.
