AP Physics Assignment Wave Interference Purpose: examine some of the concepts of interference of light through double and single slits. Procedure: Refer to the PhET Physics Simulation \"Wave Interference\" Part A. Settings: Separation around 2000 nm Start with red light: Click on: Show screen and intensity. Recall the following for the double slit interference experiment: L = distance from the slits to the screen d = distance from the middle of one light source to the middle of the other light source. x = distance from the central bright band to the adjacent bright band. it = wavelength of the light. Relationship between the variables: L = (1 sin 0 if L >> x then you can use the approximation sin 0 = x/L thus: A = dx/L in this experiment we can not use this approximation, so we will calculate E) = tan'1 (x/L) (a) Use the ruler to take accurate measurements of x, (from the intensity graph) L, d for three different wavelengths (colors) of light. Tabulate data. Analysis (a) Calculate the wavelength of light for each of your three colors. Comment on the accuracy of your results, are you within a reasonable % difference between your values and the approximate accepted 1. values? (b) Neatly sketch an interference intensity pattern as a functi0n of the position along the screen for one of your wavelengths and describe qualitatively how the intensity pattern (value of x) changes when you vary the wavelength (7L) of the light. Conclusions 1. Before double slits became commercially available we used to made our own by holding two razor blades together and pulling then across a microscope slide that had been painted black. Assume you made such a \"double slit" and you want to determine its slit width. Describe an experimental set-up you could do to determine the slit width. (a) List the equipment you would use (b) Draw a neatly labeled diagram of your experimental set-up (c) State the measurements you would make (CD Show the equation(s) you would apply to determine the slit width. 2. Interference and diffraction are two optical phenomena that can be explained using the wave theory of light. Research the topic and explain in simple terms Mother phenomena that can explained using the wave theory of light. 3. Research the topic and explain the difference in the interference pattern between a single slit and double slit. Use a diagram to assist in your explanation