7CDLM02_201003ActivSheets

7CDLM02_201003ActivS - Physics 7C DLM 02 Overview DLM 02 Model Plane Waves Act 8.1.3 Representing a 1-D Harmonic Wave Graphically(~90 min Learning

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Physics 7C DLM 02 Overview DLM 02 Model: Plane Waves Act 8.1.3 Representing a 1-D Harmonic Wave Graphically (~90 min) Learning Goals: Understanding that the displacement of the medium when a harmonic wave is present depends on two parameters: position and time Understanding that it takes two graphs, one as displacement of medium vs. time and one as displacement of medium vs. distance to completely represent a wave graphically Understanding that the graph of a harmonic wave as a function of either position or time is sinusoidal (i.e., corresponds to a sine or cosine function) Understanding that it takes a mathematical function of two variables (e.g., y and t) to represent a wave (i.e., a wave function) Act 8.1.4 Waves and the Wave Equation (~50 min) Learning Goals: Solidify ideas about wave parameters and graphing waves Understand that y(x,t) - y 0 = Asin 2 π t T ± 2 π x λ + φ ⎟ = Asin Φ (x,t) is the 1-D harmonic wave function and that when graphed as a function of either x or t, while holding the other variable constant, a sine wave results. Begin understanding the total phase Φ( x,t) Reading Assignment Read the first portion of the 7C Course Notes on Waves. (available online)
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Physics 7C Activity 8.1.3 DLM 02 Representing a 1-D Harmonic Wave Graphically View the following Java applets within the Safari web browser on the Apple iBook located at your table; these files, named “transverse.html” and “longitudinal.html”, are linked to a main file called “overview.html”, which is found in the folder “Student Files/7C” on the hard drive. Discuss in your group and put on the board ( actually do the work at the board ) : 1) Start the animation for the Transverse Wave . Which way is the wave moving? 2) Click on a point in the animation at least λ /4 (a quarter wavelength) away from the edges. Describe the motion of the yellow dot that appears (for now we will ignore the red dot). Click on another spot in the wave, and describe the motion there. 3) Focusing on the location of the yellow dot, make a graph with clearly labeled axes of the displacement of that spot as a function of time . Make sure you have room to draw another graph directly below it. The leftmost blue dot is at position = 0 m, the middle at 50m, and the rightmost is at position = 100m. The time is shown on the screen. Use these values to estimate numerical labels for your axes.
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This note was uploaded on 11/15/2010 for the course PHY PHY07C taught by Professor David during the Winter '09 term at UC Davis.

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7CDLM02_201003ActivS - Physics 7C DLM 02 Overview DLM 02 Model Plane Waves Act 8.1.3 Representing a 1-D Harmonic Wave Graphically(~90 min Learning

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