1. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Longitudinal or Transverse? 1

2. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. Parts of a Transverse Wave 2

3. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. The Speed of Light American physicist, Albert Michelson proved that the speed of light was 300 000 km/s or 300 000 000 m/s. 3

4. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. The 4 fundamental forces of nature…without it we would all fly apart 1)Strong 2)Weak 3)Electromagnetic 4)Gravitational 4

5. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. The Electromagnetic Spectrum 5

6. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. What does ‘Electromagnetic’ mean?  When an electric charge (usually in motion) produces a magnetic field….so electromagnetic means ‘relating to magnetism and electricity 6

7. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. What does the word ‘Spectrum’ mean?  The word ' spectrum' (the plural of which is 'spectra') comes from a Latin word,spectare, which means 'to make a display out of something'spectrum 7

8. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. A few important facts before we begin 1)All the waves on the EM spectrum travel at the same speed…the speed of light… 300 000 000 m/s or 300 000 km/s 8

9. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. A few important facts before we begin 2) Each wave has a different wavelength 3) Each wave has a different frequency 9

10. General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc. An EM presentation  http://www.bbc.co.uk/schools/gcsebitesize/science/ed excel/electromagnetic_spectrum/electromagneticspe ctrumact.shtml http://www.bbc.co.uk/schools/gcsebitesize/science/ed excel/electromagnetic_spectrum/electromagneticspe ctrumact.shtml  http://www.bbc.co.uk/schools/gcsebitesize/science/ed excel/electromagnetic_spectrum/electromagneticspe ctrumact.shtml http://www.bbc.co.uk/schools/gcsebitesize/science/ed excel/electromagnetic_spectrum/electromagneticspe ctrumact.shtml 10