PHY 212 (Spring 2011)

PHY 212 Spring 2011 Assignment Sheet #13 Page 1

Assignment Sheet 13 Week XIV: Apr. 18 - 22 Some of these assignments pertain to sections of the textbook that you were not required to purchase for this course. A copy of the associated homework problems is appended to this sheet; a copy of the text material is posted to blackboard (documents tab). Lecture Topics and Text Readings:

1. Electric and magnetic fields: effects of motion (35.1). 2. Displacement current and the electromagnetic field laws (35.2, 3). 3. Sinusoidal traveling waves and plane waves (20.3, 20.4). 4. Maxwell’s equations and electromagnetic waves (35.4, 35.5).

Recitation Assignments: [Wed:35-2(wb), 35-6(wb), 35-7(wb), 35-8(wb), 35-9(wb); 35-3(pe), 35-28(pe), 35-31(pe)] Note: There is no recitation on Friday 22 April due to the holiday. However, I strongly recommend that you do the following problems from Chapter 20: 20-17(wb), 18(wb), 22(wb); I will post the solutions to these problems on Blackboard on Friday.

Study Questions and Related Homework Problems 1. What is the Lorentz force? Do 35-28 (pe) & 35-31(pe). 2. How can electric and magnetic fields be transformed to accommodate different reference frames? Do 35-2(wb) & 35-3(pe). 2. What are Ampere’s Law and the displacement current? Do 33-24(wb), 35-6(wb), 7(wb). 3. What is the Ampere-Maxwell Law? How do the fields induced from time-varying electric and magnetic fields compare? Do 35-8(wb) & 35-9(wb). Study Questions for Strongly Recommend Problems 1. What are the properties of a sinusoidal traveling wave? Do 20-17(wb), 18(wb). 2. What are the spatial properties of a sinusoidal plane wave? Do 20-22(wb).

PHY 212 (Spring 2011)

PHY 212 Spring 2011 Assignment Sheet #13 Page 2

Week XV: Apr. 25 – 29 Some of these assignments pertain to sections of the textbook that you were not required to purchase for this course. A copy of the associated homework problems is appended to this sheet; a copy of the text material is posted to blackboard (documents tab). Lecture Topics and Text Readings: 1. Maxwell’s equations and electromagnetic waves continued (35.4, 35.5). 2. Energy, intensity, and polarization of electromagnetic waves (35.6, 35.7). 3. Sound and light (20.5). 4. Interference in one dimension (21.5). 5. The mathematics of interference (21.6). Recitation Assignments: [Wed: 35-11(wb), 12(wb), 13(wb), 14(wb), 15(wb), 16(wb); 35-27(pe), 42(pe).] [Fri: 21-9(wb), 10(wb), 11(wb), 12(wb), 13(wb), 20-25(wb), 26(wb); 21-63(pe)]

Study Questions and Related Homework Problems 1. What is the structure of an electromagnetic wave? Do 35-11(wb), 12(wb). 2. What is meant by the intensity of an electromagnetic wave? Do 35-13(wb), 35-42(pe). 3. How do polarizers ‘modify’ electromagnetic waves? Do 35-14(wb), 15(wb), 16(wb), 27(pe). 4. How do sound waves from two speakers in different locations “add” in space at a particular time? Do 21-9(wb). 5. How does the sound wave created by superposing two waves evolve over time? Do 21-10(wb). 6. What are the conditions for constructive and destructive interference of two waves? Do 21-11(wb), 12(wb), 13(wb). 8. What is the meant by the index of refraction? What happens to light waves in materials with different refractive index? Do 20-25(wb), 26(wb). 9. Explain the interference of light waves created by surfaces of an oil film. Do 21-63(pe). Copy of “end of chapter” problem 21-63(pe). 21-63(pe). A sheet of glass is located with a 500 nm thick layer of oil (n = 1.42). a. For what visible wavelengths of light do the reflected waves interfere constructively? b. For what visible wavelengths of light do the reflected waves interfere destructively? c. What is the color of the reflected light? What is the color of the transmitted light?