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Intermolecular bonds between kentchemistry YouTube Channel
E. Wave Nature of Light
2 Competing Theories:
Behavior of Light Supporting Wave Theory
1. Diffraction – light spreads out into the region behind an obstacle
2. Interference – Young’s Double Slit - Late 1800's
Pattern created by a single
light wave
Claus_Jönsson_Interferenz.jpg Prof Dr. Claus Jönsson
St. Mary's Physics
St. Mary's Physics
Monochromatic Coherent
Which light source is coherent?
June 1997 Regents Test
Double Slit - Wavelength
Difference-
| Larger | St. Mary's Physics
If you draw a line from each slit to the 1st order bright line, you will notice that one line is longer than the other.
The difference between these two lines is 1λ.
Destructive Interference
Enrichment
Ex) Calculate the distance between two slits in a Double Slit Experiment if the wavelength of the light used is is 5 x 10-7 m and the distance between the central maximum and the first order bright line is 2 x 10-2 m. The distance from the slits to the screen is 4 meters.
Question: If they give you d, L and x and asked you to find the COLOR of the light used, What would you do? Where would you go to find the color?
Answer: 1. Solve for λ use Young's Equation 2. Use 3 x 108 m/s = fλ to find the colors frequency 3. Look up the color on page 2 Ref.
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