Cuesta College, San Luis Obispo, CA
Students have a weekly online reading assignment (hosted by SurveyMonkey.com), where they answer questions based on reading their textbook, material covered in previous lectures, opinion questions, and/or asking (anonymous) questions or making (anonymous) comments. Full credit is given for completing the online reading assignment before next week's lecture, regardless if whether their answers are correct/incorrect. Selected results/questions/comments are addressed by the instructor at the start of the following lecture.
The following questions were asked on reading textbook chapters and previewing presentations on diffraction and charges and materials.
Selected/edited responses are given below.
Describe something you found interesting from the assigned textbook reading or presentation preview, and explain why this was personally interesting for you.
"I thought it was interesting that the smaller the slit the larger the spread. That is somewhat counterintuitive but pretty cool."Describe something you found confusing from the assigned textbook reading or presentation preview, and explain why this was personally confusing for you.
"The diagrams of the inlets opening and closing and the effects that it had on the spread on the waves was really interesting."
"I really like the explanation of insulators and conductors in the blog. I have learned about them in the past and was confused, but I felt like it was really well explained."
"I liked the animated GIF of the girl at the gas station. I have watched a few training videos for firemen, and I am always amazed what static electricity can do."
"I would think that as the slit gets larger, the more waves can get through, and at more angles. I am confused that it works opposite."Discuss the difference(s) between d and a for the d·sinθ = m·λ equation used for double slit interference, versus the a·sinθ = m·λ equation used for single slit diffraction.
"I don't really understand the diffraction minima concept. It would help to go over it in class."
"I am confused by why m = ±1 for finding the diffraction minima in a·sinθ = m·λ."
"How do you find the minima angle θ? It looks just like a spread angle θ."
"I was confused when in the book it says that an electrically neutral object may have regions of positive and negative charge within it separated from one another. How can something be neutrally charged but also has positive and negative areas? Do the charges cancel out to become neutral?"
"I am actually confused at this."A gas pump fire is inadvertently caused by the sudden discharge of an electrical spark. Describe when and how the woman got electrically charged.
"a is the width of the slit. d is the center-to-center distance between the slits when there is a double slit."
"The woman became charged when she entered her vehicle after inserting the fuel nozzle into her car. She probably got charged when her sweater rubbed against her seat. Safety procedure when fueling up a car is to manually discharge yourself by touching a metal body panel on the car before touching the fuel nozzle."Ask the instructor an anonymous question, or make a comment. Selected questions/comments may be discussed in class.
"It looks like she got an electric charge by rubbing her hands onto her fuzzy jacket and created some static electricity."
"That lady at the gas pump was pretty calm, considering."
"Please give more explanation on diffraction." (After looking at the responses distinguishing between interference and diffraction, we'll make sure we cover both interference and diffraction in class.)
Are gas station fires more common than I realize?" (Apparently not very common, approximately an average of ten static electricity fires a year, out of 16-18 billion fuel stops a year in the U.S.)
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