PHY2054: Chapter 221Chapter 21 QuizÎWhich of the following has nothing to do with EM waves? (a) Dental x-rays (b) Radio broadcasting (c) Strumming a guitar (d) Cooking a microwave dinner (e) Responding with your HITT transmitterPHY2054: Chapter 222Chapter 21 QuizÎA grain of interplanetary dust is in the Sun’s gravitational field. Ignoring all other influences, is it possible for the grain to move away from the Sun? (a) Yes, if the grain is sufficiently large (b) Yes, if the grain is sufficiently small (c) No, it cannot escape the Sun’s gravitational fieldPHY2054: Chapter 223Chapter 21 QuizÎWhich statement is true? The energy carried by an electromagnetic wave in a vacuum (a) propagates at the speed of light (b) consists of only electric field contributions (c) propagates along the direction of the electric field (d) consists of E and B fields pointing in the same direction (e) none of the abovePHY2054: Chapter 224Chapter 22: ReflectionÎLaw of reflection Incident ray, reflected ray, normal lie in one plane11θθ′=PHY2054: Chapter 225Reflection Law Applies to non-Flat Surfacesθθ′PHY2054: Chapter 226Chapter 22: RefractionÎIndex of refraction n and speed of light in mediumÎLaw of refraction (Snell’s law) Incident ray, refracted ray, normal lie in one planecvn=112 2sin sinnnθθ=n1n2PHY2054: Chapter 227Refraction at Air-Water Interface1θ11.000n=21.333n=2θ48.6°90°46.4°75°40.5°60°32.0°45°22.0°30°11.2°15°0°0°θ2θ1112 2sin sinnnθθ=Critical angle (more
View Full Document
Unlocking...