1. (2 points) Which of the following statements contradicts one of Maxwell's equations? A. A changing magnetic field produces an electric field. B. The net magnetic flux through a closed surface depends on the current inside. C. A changing electric field produces a magnetic field. D. The net electric flux through a closed surface depends on the charge inside. E. None of these statements contradict any of Maxwell's equations. 2. (2 points) Electromagnetic waves are waves that can be generated by a(n) A. transverse / static electric charge B, transverse / fluctuating current - C. transverse / constant current D. longitudinal / constant current E. longitudinal / fluctuating current -E. Infrared radiation has the longest, x rays the shortest. 4. (2 points) A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is A. 135 from the original direction. B. 45 from the original direction. C. 90 from the original direction. D. 180 from the original direction. E. between 90 and 180 from the original direction. 5. (2 points) A glass block with index of refraction 1.50 is immersed in water whose index of refraction is 1.33. What is the critical angle at the glass-water interface? 1 A. 41.90 1.50 sin Ocrit = 1.33 singTo B. 48.80 Ocrit = 62.50 C. 56.30 D. 62.50 E. Total internal reflection is not possible in this case.7.) (2 points) A ray of light passes from air into water, striking the surface of the water with an angle of incidence of 450. Which of the following four quantities change as the light enters the water: (1) wavelength, (2) frequency, (3) speed of propagation, and (4) direction of propagation? A. 1 and 2 only V = no 1. sin950 = 1.33. Sin Brefrac. h = he B. 2, 3, and 4 only C. 1, 3, and 4 only D. 3, and 4 only E. 1, 2, 3, and 4 8. (2 points) When the transmission axes of two Polaroid films (=polarizers) are at an angle of 60 to each other, what percentage of the light coming out of the first film will pass through the second? A. 100% B. 75% C. 50% 2 1 = _ I. Cos260 2 D. 25% 0. 125 = 0.1251. E. 0% 25%. 0.5(Questions 16-22) Having lots of free time during Thanksgiving, you're contemplating all the marvelous things you learned about light in Physics SC and decide to perform experiments using your red laser pointer, whose light has wavelength of 650nm (1nm=10_9m). So, you point the laser on the block of glass shown below (31 = 1.5, D = 5cm) and observe its path as you move it around. C. 19.45 D. 26 E. 30 Physics 60 Midterm Exam 1 Page 5 of 5 October 24, 2018 17. (2 points) Assuming an incident angle 91 = 45, what is the angle 93? SMWS" -: 159M903 C. 411.75" D. 19.450 E. 26 (2 points) How long does it take for the refracted part of the light to travel from the top end to the bottom end of the block? A. 0.167 x 10-93 'r ? . 0.190 x 10-93 . 0.223 x 10-9s . 0.250 x 10-99. . 0.284 x 10-93 b15005 E. 260 18. (2 points) How long does it take for the refracted part of the light to travel from the top end to the bottom end of the block? A. 0.167 x 10-9's + ? B. 0.190 x 10-9s C. 0.223 x 10-9's D. 0.250 x 10-9s E. 0.284 x 10-9s 19. (2.5 points) Assuming an incident angle 01 = 45, what is the distance d (see figure above)? A. 4.3cm B. 4.65cm C. 5cm D. 5.35cm E. 5.7cm . (2 points) Assuming an incident angle 01 = 60 instead, what is the angle 04? A. 60 B. 30 sin60 = ngsin Dg C. 19.450 D. 26 ng sin ( 90 - Og) = sin Ou 3 E. 41.750 21. (2.5 points) What are the frequency and wavelength of the laser light inside the glass? A. 461 x 1012Hz, 650nm h = ho = 650 B. 307 x 1012Hz, 650nm V = C = 3x108 1.5 1.5 C. 307 x 10 2Hz, 433nm D. 461 x 1012Hz, 433nm v= hf ; f = E. 195Hz, 433nm 22. (2 points) Can you orient the laser so that no light goes in the block? If yes, what is the critical value of 01 for total reflection? A. Yes, 0c = 45 na sin ba = ng B. Yes, 0c = 41.750 C. Yes, 0c > 45 nacng D. No, because nglass > nair. E. No, because nglass