CK-12 Physical Science Concepts - For Middle School

5.93. References http://www.ck12.org

127. Christopher Auyeung. Diagram of convex mirror. CC BY-NC 3.0


128. Marcin Wichary. Car mirrors are convex mirrors. CC BY 2.0


129. Magnus Akselvoll. Traffic mirror. CC BY 2.0


130. Joy Sheng. Diagram of refraction. CC BY-NC 3.0


131. Christopher Auyeung. Concave lens. CC BY-NC 3.0


132. Christopher Auyeung. Convex lens. CC BY-NC 3.0


133. User:Tomia/Wikimedia Commons, modified by Christopher Auyeung (CK-12 Foundation). Schematic of a
     light microscope. CC BY 2.5


134. Christopher Auyeung. Schematic of a telescope. CC BY-NC 3.0


135. Laura Guerin. Schematic of a camera. CC BY-NC 3.0


136. Left: Flickr:jeffreyw; Right: Christopher Auyeung. Lasers are created by tight beams of coherent light. Left:
     CC BY 2.0; Right: CC BY-NC 3.0


137. Christopher Auyeung. Schematic of a laser. CC BY-NC 3.0


138. User:Gringer/Wikimedia Commons. Schematic of an optical fiber. Public Domain


139. Original by User:Rhcastilhos/Wikimedia Commons, modified by CK-12 Foundation. Diagram of the eye.
     Public Domain


140. Laura Guerin. Signal transmission from eyes to brain. CC BY-NC 3.0


141. Laura Guerin. Illustration of individual with Myopia. CC BY-NC 3.0


142. Laura Guerin. Illustration of individual with Hyperopia. CC BY-NC 3.0


143. Christopher Auyeung. Location of charges in an atom. CC BY-NC 3.0


144. Zachary Wilson. Like charges repel each other. CC BY-NC 3.0


145. Christopher Auyeung. Point charge electric field. CC BY-NC 3.0


146. Christopher Auyeung. Field lines of two close charges. CC BY-NC 3.0


147. Christopher Auyeung. Ions are created by the loss or gain of electrons. CC BY-NC 3.0


148. Christopher Auyeung. Objects can get polarized when charged objects are nearby. CC BY-NC 3.0


149. Flickr:olga.palma. A positively charged balloon will attract negatively charged hair. CC BY 2.0


150. Zachary Wilson. Lightning is the result of the discharge of static electricity. CC BY-NC 3.0


151. Zachary Wilson. Flow of electrons in a circuit. CC BY-NC 3.0


152. Christopher Auyeung. Chemical cell. CC BY-NC 3.0


153. Christopher Auyeung. Solar power cell. CC BY-NC 3.0


154. Olga Reznik. Lightbulb. CC BY 2.0


155. Flickr:solarbotics. Closeup of copper wires. CC BY 2.0


156. Christopher Auyeung. A properly closed circuit. CC BY-NC 3.0


157. Christopher Auyeung. Circuit diagrams utilize a standard set of symbols to represent circuits. CC BY-NC 3.0


158. Image copyright Sue McDonald, 2014. Frayed cords are dangerous. Used under license from Shutter-
     stock.com


159. Plug: Samuel M. Livingston; Circuit breaker: Flickr:davef3138; GFCI: http://www.homespothq.com/. A
     variety of safety features help protect users. CC BY 2.0


160. Christopher Auyeung. Typical analog signal. CC BY-NC 3.0


161. Christopher Auyeung. Typical digital signal. CC BY-NC 3.0


162. User:Guillom/Wikimedia Commons, modified by CK-12 Foundation. Semiconductors are created by "dop-
     ing" silicon. CC BY 2.5


163. Christopher Auyeung. Diagram of a diode. CC BY-NC 3.0


164. Christopher Auyeung. Diagram of a transistor. CC BY-NC 3.0


165. Flickr:fdecomite. Microchips are very small. CC BY 2.0


166. Laura Guerin. Parts of a computer. CC BY-NC 3.0


167. Image copyright MilanB, 2014. Bar magnet. Used under license from Shutterstock.com


168. Marc Spooner. Iron fillings attracted to a bar magnet. CC BY 2.0


169. Christopher Auyeung. Magnetic field lines formed by bringing two magnets close to each other. CC BY-NC
     3.0


170. Christopher Auyeung. Magnetization of domains causes ferromagnetic materials to become magnets. CC