1. LIGHT REVIEW MRS. ROSE HCHEM 2015

2. WHAT IS THE WAVELENGTH AND FREQUENCY OF LINE 1 AND LINE 2?

3. ENERGY OF WAVES – IT TAKES MORE ENERGY TO TRAVEL AT A HIGHER FREQUENCY… Low frequency High frequency, short wavelength Amplitude Low frequency, long wavelength short wavelength 

4. What kind of relationship exists between wavelength and frequency? A)Logarithmic B)Quadratic C)Direct D)Inverse Rueben’s TubeTones

5. ELECTROMAGNETIC RADIATION Vision

6. VISIBLE PART OF EM SPECTRUM PRISM Slit Ray of White Light Waves 1 / 33,000 ” long Waves 1 / 70,000 ” long R ed O range Y ellow G reen B lue I ndigo V iolet 400 nm – 700 nm

7. VOCABULARY OF A WAVE Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 324 A c = speed of light = 2.998 x 10 8 m/s (really fast, true for every kind of light!)

8. FREQUENCY O’Connor, Davis, MacNab, McClellan, CHEMISTRY Experiments and Principles  1982, page 166 1 second Frequency 4 cycles/second = 4 hertz 12 cycles/second = 12 hertz 36 cycles/second = 36 hertz

9. WAVES Wavelength ( ) - length of one complete wave. Common units: m or nm Frequency () - # of waves that pass a point during a certain time period (usually per second) Common Units: hertz (Hz) = 1/s = s -1 Amplitude (A) - distance from the origin to the trough or crest (height of one wave) Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

10. WHICH COLOR OF VISIBLE LIGHT HAS THE LONGEST WAVELENGTH? A) YELLOW B) BLUE C) RED D) VIOLET

11. WHICH TYPE OF LIGHT HAS MORE ENERGY THAN VISIBLE LIGHT BUT LESS ENERGY THAN GAMMA RAYS? A) Radiowaves B) Microwaves C) Infrared D) UV rays

12. REVIEW 1) Which color of light (Red or Violet) does wave B represent? 2) Which wave has the lowest frequency? 3) Which wave has the most energy? 4) Which wave has the shortest wavelength? 5) Which wave travels the fastest?

13. WHAT HAPPENS WHEN RED, GREEN AND VIOLET LIGHT ARE DIRECTED AT A GLOW-IN- THE-DARK SURFACE? FRISBEE DEMO!!

14. Vs.

15. REVIEW QuantizedContinuous

16. ABSORPTION AND EMISSION

18. absorption and emission