Asume the roof is a perfect absorber This print-out should have 38 questions. Mu

Question

Asume the roof is a perfect absorber This print-out should have 38 questions. Multiple-choice questions may the next column or page before answering. continue on - find all choices Determine the radiation pressure. Answer in units of Pa. Message from Dr. Williams: The deadline for completing this homework is on THURS Find the radiation force on the roof assuming DAY, July 26, 2018, at 11 pm, local Talla- that the roof covering is a perfect absorber hassee time.These problems cover Chapter 22 Answer in units of N (Electromagnetic Waves), Chapter 23 (Light Geometric Optics), Chapter 24 (The Wave Nature of Light), and Chapter 25 (Optical Coder a beam of electromagnetic radia- Instruments) in the textbook, Giancoli 003 (part 3 of 3) 10.0 points 004 (part 1 of 4) 10.0 points tion, which is traveling along the positive ar Read Chapter 22 (Electromagnetic Waves)direction. Its average intensity is 247 W/m in the textbook. I recommend that you study the Example Problems 22-4, 22-5, 22-6 and Answer in units of N/C 22-7 What is its maximum electric field? Read Chapter 23 (Light: Geometric Op- tics) in the textbook. Read Sections 23- What is the the maximum magnetic field? through 23-8.I recommend that you study Answer in units of T the Example Problems 23-1, 23-4, 23-6, 23-7 23-8, 23-10, 23-12, 23-13 and 23-14 005 (part 2 of 4) 10.0 points 006 (part 3 of 4) 10.0 points Read Chapter 24 (The Wave Nature of hasthe pressure on a surface which is Light) in the textbook. Read Sections 24- 1, 24-2 and 24-3. I recommend that you study tive? Examples 24-1, and 24-3 perpendicular to the beam and is total reflec- Answer in units of Pa. Read Chapter 25 (Optical Instruments) in the textbook. Read Section 25-2 (Human Eye). I recommend that you study the Exam- ple Problems 25-5 and 25-6 007 (part 4 of 4) 10.0 points Consider a wave pattern such that when the instantaneous magnetic field is pointing in the r-direction, the corresponding electric field is pointing in the negative y-direction. Start reading Chapter 26 (The Special The- ory of Relativity) in the textbook. Read Sec- tions 26-1, 26-2, 26-3 and 264 and study Example 26-3. Read Section 26-5 and study travelins Example 26-5. Read Section 26-6 through 26 11 for qualitative understanding and study Example 26-10. The Special Th Find the direction in which the wave is 1. along positive a direction 2. along negative direction 3. along positive r direction 4. along positive y direction 5. along negative direction 10 m x 28 m, assuming the. along negative y direction Problems 34 to 38 of this homework set are conceptual problems for students to investi- gate 001 (part 1 of 3) 10.0 points The Sun delivers about 1425 W/m2 of elec- tromagnetic flux to the Earth's surface Calculate the total power incident on a roof radiation is incident normal to the roof. Answer in units of W 008 (part 1 of 3) 10.0 points A possible means of space flight is to place 002 (part 2 of 3) 10.0 points

Explanation / Answer

001: P = I A = (1425 W/m^2) (10 x 28 m^2)

P = 399000 W ....Ans

002: P = I / c = (1425 W/m^2) / (3 x 10^8 m/s)

P = 4.75 x 10^6 Pa .....Ans

003: F = P A = 1.33 x 10^-3 N ....Ans

004: I = E0^2 / (2 u0 c)

247 = E0^2 / (2 x 4pi x 10^-7 x 3 x 10^8)

E0 = 432 N/C

005: B0 = E0/c = 1.44 x 10^-6 T  

006: P = 2I / c = 1.65 x 10^-6 Pa

007: v^ = E^ x B^ = -y^ x x^ = Z

Ans(1) along positive z direction

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