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Review - Explain this.
Show Me The Physics YouTube Channel
Video Instruction showmethephysics.com
Fill in the Blank Notes
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
Laser Diffraction and Interference School Blocks YouTube? Use the file below. Show Me The Physics YouTube Channel
2. Interference Young's Double Slit - Early 1800's
Which letters show constructive interference? destructive interference?
Constructive - A, B, D, E
Destructive C, F (Crest / Trough)
Move your mouse left and right over the simulation below
Show Me The Physics
λ/d = x/L - Flash Show Me The Physics
Monochromatic Coherent
Which light source is coherent?
June 1997 Regents Test
Choice 4
Double Slit - Wavelength
Difference-
Name that interference / Wavelength shift?
| Flash | Show Me The Physics Website
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 Wavelength difference
AP B Physics Finding 2nd, 3rd, 4th
q = angle between slits and line d = distance between slits m = 0, 1, 2, .... order bright lines m = 1/2, 1 1/2, 2 1/2 dark lines q = angle to bright line x/L = ml/d x = distance from central maxima
 AP Physics 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.
Tony Mangiacapre., - All Rights Reserved [Home]
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