General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Grades close this Friday. Please complete all make-up work by then.

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Presentation transcript:

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Grades close this Friday. Please complete all make-up work by then. 1

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Homework Assignment: Vocabulary 2

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. When a tree falls in the forest, and there is no one to hear it, does it make a sound? 3

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. What is the last sense to go, when you are dying? 4

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Sound 5

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Where does sound come from? 1) All sounds are produced by the vibrations (moving back and forth) of objects 2)Examples: guitar string, vocal chords, drum 3) The original vibration sets something larger in motion (guitar, chest/throat) 6

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. This sets air in motion…which result in compressions and rarefactions  Compression: compressed air from a pulse  Rarefaction: the empty space (low pressure) area behind the compression 7

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. This results in a longitudinal wave…sound travels in a longitudal wave 8

General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Longitudinal wave Definition: A wave in which the vibration is in the same direction as the wave is traveling 9