Physics2 Fall2006 Final

# Physics2 Fall2006 Final - Physics 1302 Final Exam Name Fall...

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Unformatted text preview: Physics 1302 Final Exam Name Fall 2006 Prof. J. Miller 1 Version MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. '\ Figure 21—11 29 g WVW‘ 4o 1) Four resistors of values 2.0 Q, 4.0 9, 3.0 Q, and 9.0 Q are connected across a DC source with voltage V as shown in Figure 21—11. If the total current through this circuit is 2.0 A, what is the current through the 4—9 resistor? .0A B) 2.4A C)1.3A D) 1.0A 2) The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron? A) 2.04x 103 m/s @192x 103 m/s C) 3.83x103 m/s D) 4.12x103 m/s 3) Which of the following expressions is correct for the transmitted intensity of an initially unpolarized beam of light with an intensity Ii after passing through a polarizer? (‘Aﬂt = 211 It = (1/4) Ii C) It = (1/2) Ii b)1t:11 4) An electric device delivers a current of 3.0 A for 10 seconds. How many electrons flow through this device? A) 20 B) 2.0 C) 19 x 1020 ‘43)}.9 x 1020 \ﬂ )7, 5) What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm. 'A) 14.5 x 1018 photons/s B) 6.34 x 1018 photons/s C) 25.3 x 1018 photons/s D) 3.11 x1018 photons/s A—l Figure 23—5 x x x x x X x I x x x x x x x l R Z Fapplied x x x x x x x a C 7 a 7 € x x x x x x x L ‘ 1"1 {(35% 15:31 B-ﬁetd_Lm(x) v ,_‘ 6) A conducting rod Whose length is 25 cm is placed on a U—shaped metal wire that has a resistance R of 8 Q as h shown in Figure 23—5. The wire and the rod are in the plane of the paper. A constant magnetic field of strength ) 0.4 T is applied perpendicular and into the paper. An applied force moves the rod to the right with a constant speed of 6 rn / 5. What is the magnitude of the induced emf in the wire? A) 0.5 V B) 0.4 v ’6012 V D) 0.6 V 7) A 4—uF capacitor has a potential drop of 20 V between its plates. The electric potential energy stored in this B capacitor is: A) 8000 t.) B) 800 [,1] C) 8 a] . D) 80 it) 8) A 120—V rms voltage at 90 Hz is applied across a 20—1117 capacitor and a 100—9 resistor. What is the rms value of the current in that circuit? ' A) 0.9 A I B) 0.7 A C) 0.8 A D) 1.0 A 9) What is the radius of the Smallest Bohr orbit? A) 3.17 x 10-11 m 'B),5.29 x 10-11 m C) 2.14 x 10-9 m D) 1.12 x 10-9 In 10) A 4.0 cm tall object is placed 60 cm away from a converging lens of focal length 30 cm. What is the nature and location of the image? \ A) The image is Virtual, 4.0 cm tall, 60 cm on the same side as object. .‘ ‘ ’_ 2 m L- ‘ I r < :fBﬁ'he image is real, 4.0 cm tall, 60 cm on the other side of the lens. D A K b ‘“‘ C) The image is real, 2.5 cm tall, 30 cm on the same side as object. ' K j D) The image is Virtual, 2.5 cm tall, 30 cm on the other side of the lens. 11) In a two—slit experiment, the slit separation is 2.20 x 10‘5 m. The interference pattern is created on a screen that is 2.00 m away from the slits. If the 7th bright fringe on the screen is a linear distance of 10.0 cm away from the central fringe, what is the wavelength of the light? A) 167 mm B) 147 nm nm D) 177 nm 12) A +2—11C charge is at rest in a magnetic field of 2 T pointing along the +x—axis. What is the force acting on this E charge in the magnetic field? - A) —4 HN B) 0 N C) +2 uN D) +4 tLN A 13) What power contact lens must be used to correct the Vision of a nearsighted person whose far point is 40 cm? A) —2.5 diopters B) —4.0 diopters C) diopters D) 4.0 diopters 14) The wavelength of light in a certain transparent liquid is 360 nm and the wavelength of light in vacuum (from the same monochromatic source) is 469 run. What is the index of refraction of the liquid? A) 1.10 B) 1.70 C) 1.50 Brno 15) The magnetic field due to the current in a long, straight wire is 8.0 [1T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? L: 7 A) 3.2 A B) 0.40 A ‘3‘ 5 ‘3 C) 0.80 A ‘5 " 55- (Dbts A r; \_\ erf “4 16) The near point of a farsighted person is 75 cm. What power contact lens he must use to correct this problem and be able to read a book at a normal near point of 25 cm? A A) —4.2 diopters B) 2.7 diopters C) ~2.7 diopters D) 4.2 diopters Figure 19—4 —C? a’ -5: d -0 17) Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in Figure 19—4. Which of the arrows shown represents the net force acting on the center charge? I“ l_A)>A B) B C)C DH) 18) John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe? ‘ ' _ A) four times as large as his face 4 _ @Dhree times as large as his face)“ I l C) twice as large as his face .1; 1 r 7 D D) of the same size as his face I to 19) An electron is initially at rest, it is accelerated through a potential difference of 400 V. What is the kinetic energy of this electron? A) 6400) a)“ x 10-17) c) 0] D) 4.0 x 102 J 20) Two point charges of +600 uC and —12.0 MC are separated by a distance of 20.0 cm. A +7.00 tLC charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges? A) 453 N directed towards the positive charge @3353 N directed towards the positive charge B) 453 N directed towards the negative charge D) 4.53 N directed towards the negative charge A—3 21) A 100—9 resistor is connected in series with a 10—mI-l inductor across an ac source operating at 1000 Hz. What is the impedance of this circuit? A) 100 o B) 1000 o C) 200 o (D) 118 e 22) When the current through a resistor is increased by a factor of 4, the power dissipated by it A A) increases by a factor of 16. B) decreases by a factor of 4. (Ejlhcreases by a factor of 4. F, D) decreases by a factor of 16. 23) A piece of glass has a thin film of gasoline on its surface. A beam of light is shining perpendicular on the film. If . the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 A and 1.50, respectively, what is the minimum thickness of theme to see a bright reﬂection? A) 200 nm E) 400 nm 900 nm D) 300 nm Figure 23—4 """ " dart.» t t t t t I 0 (b) (a) «:7 24) A bar magnet with its south pole pointing toward a solenoid, of cross—sectional area 0.020 m2 and total number {‘3 of turns equal to six, is stationary, as shown in Figure 23—4(a) (right—hand figure only). What is the direction 'of the induced emf in the loop of wire (when looking at the end of the coil where the S pole is pointed toward you)? A) counterclockwise V B) There is no emf induced. ’WIOCkWise D) None of the other answers is correct. you see the light passing you by? {Eye/3k 5) (1/3)C C) c D) It depends on whether you are moving towards or away from Randy. C 25) You are moving at a speed (2/ 3)c relative to Randy, and Randy shines a light toward you. At what speed do A—4 ...
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## This note was uploaded on 03/15/2009 for the course PHYSICS 1102 taught by Professor Miller during the Spring '06 term at University of Houston.

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Physics2 Fall2006 Final - Physics 1302 Final Exam Name Fall...

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