7CDLM05_201003ActivitySheets - Physics 7C DLM05 Overview...

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Physics 7C DLM05 Overview DLM 05 Model: Superposition of Waves Act 8.2.3 1-D Interference: FNT’s from DLM04 (~40 min) Combine the remainder of Activity 8.2.2 with these FNT’s if needed Learning Goals: See Activity 8.2.2 Model: 2-D Superposition of Waves Act 8.3.1 2-D Interference Due to Path Length Difference (~80 min) Learning Goals: Develop a graphical method for understanding interference between two waves of two or more dimensions Understand that two waves of the same frequency, originating from sources separated from one another, create an alternating pattern in space of constructive and destructive interference Recognize that this spatial interference pattern is the direct result of difference between the path lengths measured from every point back to each wave source Recognize that, as with the previous 1-D case, the total phase difference ΔΦ at each point in 2-D or 3-D space determines whether constructive or destructive interference occurs Act 8.3.2 Why Do We Think That Light is a Wave? (~20 min) Learning Goals: To understand the evidence that light is some kind of wave To understand that slits act as sources of separate waves with the same frequency and phase of the wave impinging on the slits. To understand how to apply the diffraction formula nλ = dsinθ to various geometries and to make sense of the patterns seen by both transmission and reflection diffraction gratings. To understand that white light is a combination of a multiple wavelengths in the range from 400 to 700 nm, with red being at the longer end and violet at the shorter end of the continuous spectrum
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Physics 7C Activity 8.2.3 DLM05 1D Interference A) Compare solutions to FNTs 1, 2, and 3. 1) For each question, make certain that each member of the group can a) identify the correct answer b) explain why (in a sentence or so) the interference type matches the scenario. 2) On the board: Compare these three FNTs. a) What is the minimum requirement for having interference? b) What properties of the wave(s) do you need to know about to determine what type of interference occurs? c) Which pair of FNTs would you identify as being the most similar? Why? Whole Class Discussion B) Compare solutions to FNT 4. For 1-3, consider all five scenarios from the FNT to come up with a general method that works. For 4, consider only the scenario assigned by your TA. 1) On the board, write the method used to graphically determine if the speakers are wired in phase or not. 2) On the board, write the method used to graphically determine how far apart the speakers are placed (or to determine that the speakers have no separation). 3) On the board, write the method used to graphically determine if the speakers are creating loud or soft sounds. 4)
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7CDLM05_201003ActivitySheets - Physics 7C DLM05 Overview...

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