ASC 103 Lecture Notes - Lecture 9: Photosphere, Nuclear Reaction, Chromosphere

• School: Ryerson University
• Department: Architectural Science
• Course: ASC 103
• Professor: George Kapelos

Document Summary

Basic properties of the sun: rotation rate: 25 days (equator) to 30 days (poles) The photosphere: the surface of the sun, where sun changes from transparent to opaque, average temp= 5500 c, only approx. The corona: halo of gas above photosphere and chromosphere, seen only during total eclipse of the sun, temp approx. Atoms have: a nucleus made of protons and neutrons, electrons orbiting outside, examples: gold, helium, number of protons determines identity (gold= 79, helium=2) Molecules: molecules: combinations of atoms made by sharing electrons, nuclei just observe, examples: water (h2o), oxygen (o2), caffeine (c8h10n4o2) Chemical reactions: electrons in atoms or molecules change over to new partners (nuclei just observe, rearrangement often releases energy, examples: photosynthesis, fire battery power. Nuclear reactions: nuclei combine or split apart, now electrons just observe, examples: hydrogen, bombs, radioactivity, nuclear reactors, when a nuclear reaction produces energy, that energy comes from converting mass into energy, e. g.