Page 2 of 7 10) A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively. When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected? A) 410 nm and 700 nm B) 430 nm and 720 nm C) 450 nm and 740 nm D) 470 nm and 760 nm E) 490 nm and 780 nm 11) A light beam consisting of two colors, A and B, is sent through a prism. The color A is refracted more than color B. Which color has the shorter wavelength? A) A B) B C) Both of the above D) none of the above 12) What is the electric force on a -3.0 uC charge at a point where the electric field is 2800 N/C in the ty axis. A) 0.018 N, -y direction B) 0.012 N, +y direction C) 0.0084 N, -y direction D) 0.0056 N, +y direction E) 0.0084 N, +y direction 13) A pendulum is used to determine acceleration due to gravity. The measurement is done twice. First measurement gives a value of 9.0 m/s/s while a second measurement gives a value of 11.0 m/s/s. The percent difference of the measurements is A) 2.0% B) 10% C) 18% D) 20% E) 22% 14) A positive charge (+3.00 HC ) is located at points A and an identical magnitude negative charge is located at B as shown in the figure. The distance from each charge to the point P is a. From the origin the + x axis is towards B. Which one of the following statements is true at P about the net electric field Enet and net electric potential Vnet? AO B A) Enet = 0 but Vnet # 0 B) Enet = 0 and Vnet = 0 C) Enet # 0 but Vnet = 0 D) none of the above 15) An object is placed from a converging lens. A real image is formed. If s = 20 cm and s'= 30 cm, how far is the image from the object? A) 10 cm B) 18 cm C) 12 cm D) 32 cm E) 50 cm 16) Radio waves travel A) at the same speed as sound B) at the same speed as light C) much slower than sound and light D) faster than light (7) Which one is a unit for magnetic flux? A) N/(A.m) B) T/ m2 C) J/C D) Wb/ m E) J/ (A . m) 18) A single-turn loop of wire, having a resistance of 8.00 S and a cross-sectional area 200 cm2, is perpendicular to a uniform magnetic field that increases steadily from 0.200 T to 2.800 T in 2.20 seconds. What is the magnitude of the induced current in the loop? A) 2.95 A B) 3.18 A C) 0 A D) 3.18 mA E) 2.95 mA 19) An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the proton if the electron is moved 0.5 m closer to the proton? A) It decreases to one-half its original value. B) It increases to 8 times its original value. C) It decreases to one-fourth its original value. D) It increases to 2 times its original value. E) It increases to 4 times its original value. 20) An electron traveling due south in a region that contains only a magnetic field experiences a vertically upward force (away from the surface of the earth). What is the direction of the magnetic field? A) north B) east C) south D) west E) down 21) Which of the following can only be explained by a wave model of light? A) reflection B) refraction C) interference D) photoelectric effect E) all of the above F) two ( from A,B, C and) are correct