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

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

3. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Wavelength The distance from compression to compression or rarefaction to rarefaction (basically between identical parts of the wave) 3

4. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Tsunami- “harbor wave” Can travel up to 500 mph and reach heights of 100 ft 4

5. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Frequency and Hertz  How often a vibration occurs is its frequency The unit of frequency is called a Hertz (Hz) Example kHz MHz ** GHz FM stands for frequency modulation 5

6. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. What does Mach 5 mean? 6

7. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Speed of Sound Sound travels fastest in 1) solids 2) liquids 3) and slowest in gases (air) Why? 7

8. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Speed of Sound 343 m/s or 770 mph (in air) Mach is the name given for travelling at the speed of sound Sound is 15x faster in steel, 4x faster in water than air 8

9. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Which is faster, sound or light?  Light is faster than sound…a lot faster  Just count the number of seconds that pass between a flash of lightning and the crack of thunder that follows it.flash of lightning  Every 5 seconds = 1 mile 9

10. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Should you get out of a pool if you count 3 seconds between the thunder and the lightning? 10

11. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Speed of Sound calculations Speed = distance/ time 11