Multiple choice calculations 11. (2 points) The sun is 150 x 10° 11. (a polats)
ID: 1776858 • Letter: M
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Multiple choice calculations 11. (2 points) The sun is 150 x 10° 11. (a polats) The sun is 150 x 10P m from the Earth. How long does it take for light to travel this distance? (A) 50.2 s (B) 502 s (C) 6,020 (D) 50, 200s (E) 502,000 s. 12. (2 points) What is the speed of light in a material that has an index of refraction of 2.0 (A) 1.5 x 10 m/s (B) 2.0 x 10% m/s. (C) 5.0 × 10s m/s. (D) 6.0 x 10s m/s. (E) No such index can exist. 13. (2 points) In vacuum, the components of an EM wave are given as Ev = 50 (V/m) cos 15.0 m-'-+ we). where E 0 and E-0. What is the amplitude of the magnetic field of this wave? (A) 50 V/m (B) 1.67 × 10-7 T. (C) 3.00 × 10-7 T. (D) 6.00 × 10-7 T (E) 1.50 x 1010 V/m. 14. (2 points) Initially, two coherent green lasers (at 532 nm or 532 x 10-9 m) are set beside one another. Then, one of the lasers is slowly moved backwards. As it is moved, the projected light moves through a minimum, a maximum, a minimum, and stops on a maximum. How much was the laser moved? (A) 266 nm (B) 532 nm (C) 798 nm (D) 1064 nm (E) 1330 nm (F) Impossible to tell from the information given. . (2 points) What is the total magnification of a compound microscope if the separation of the two lenses is 11 cm with an eyepiece focal length of 6.25 cm and an objective focal length of 1.5 cm? Is it upright or inverted? Assume the near point for the person looking in the microscope is the normal value. (A) 1.2 cm; inverted (B) 1.2 em; upright (C) 29 cm; inverted (D) 29 cm; upright (E) 100 cm; inverted (F) 100 cm; uprightExplanation / Answer
12) speed of light in a material
v = c / n
= (3 * 108) / 2.0
v = 1.5 * 108 m/s [option A]
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