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Transcript
PHYSICS 202 Final Exam NAME____________________________________________________ 1. A 400 nm thick film of kerosene (n=1.20) is floating on water. White light is normally incident on the film. Which one of the following visible wavelengths (in air) has a maximum intensity in the reflected light? A. B. C. D. E. F. 400 nm 420 nm 480 nm 540 nm 600 nm 720 nm 2. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what is the magnitude of the magnetic field at a distance 2d from the wire? A. B. C. D. E. F. 0.0625 B 0.25 B 0.5 B 2.0 B 4.0 B 16.0 B 3. When an object is placed at the proper distance to the left of a converging lens, the image is focused on a screen 25.0 cm to the right of the lens. A diverging lens is now placed 15.0 cm to the right of the converging lens, and it is found that the screen must be moved 50.0 cm further to the right to obtain a sharp image. What is the focal length of the diverging lens? A. B. C. D. E. F. -8.0 cm -10.0 cm -12.0 cm -15.0 cm -20.0 cm -24.0 cm FaF97 4. A rectangular wire loop is pulled with a force F to the right. At the instant shown in the figure, the loop is partially in and partially out of a uniform magnetic field that is directed into the paper. As a result of the force F, the loop moves to the right at a constant speed of 8.0 m/ s. The magnitude of the field is 1.2 T. The loop has a length of 0.12 m, a width w=0.08 m, and a resistamce of 200 Ω. Determine the magnitude of the force F required to keep the loop moving at the constant speed, 8.0 m/s. A. B. C. D. E. F. × × × × × × × × × w× × × × × × × × × × × R v 0.00923 N 0.00369 N 0.00185 N 0.00147 N 0.00074 N 0.00037 N 5. The figure shows four parallel plate capacitors: A, B, C, and D. Each capacitor carries the same charge Q and has the same plate area A. As shown in the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. There is a vacuum (K=1) between the plates of capacitors A and B; and there is a dielectric (K=5) between the plates of capacitors C and D. Which capacitor(s) has the largest potential difference between its plates? A. B. C. D. E. F. A B C D K=1 K=1 K=5 K=5 d 2d d 2d A B C D A and B are the same and smaller than C or D. A and B are the same and larger than C or D. FaF97 A. B. C. D. E. F. × × × B into page × × × × × × × × × × × × R` × × × × R“× × × × V + 6. A mass spectrometer is used to separate two of the isotopes of mercury(Hg) whose masses are m1, m2 where m2>m1. Atoms of the two isotopes are ionized and exit a source with the same charge +e. The charged atoms are first accelerated through a potential difference V; they then enter a constant, uniform magnetic field B as shown. If R1=0.6075 m and R2=0.6135 m, what is the value of the ratio m1/m2? source of ionized atoms of the isotopes collecting plate × 0.9751 0.9805 0.9848 0.9901 0.9952 0.9998 7. Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -2.0 µC; sphere B carries a charge of -6.0 µC; and sphere C carries a charge of +5.0 µC. First, spheres A and B are touched together and then separated. Spheres B and C are then touched and separated. Does sphere C end up with an excess or a deficiency of electrons, and how many electrons is it? A. deficiency, 8.35×1011 B. deficiency, 3.12×1012 C. excess, 7.80×1012 D. deficiency, 9.36×1012 E. excess, 1.15×1013 F. excess, 1.40×1013 8. In a nuclear reactor, mass is annihilated at the rate of 1.0 microgram/sec. If 70% of the energy produced is converted to electrical power, what is the electrical power output? A. B. C. D. E. F. 63 megawatts 30 kilowatts 45 megawatts 60 kilowatts 300 watts 300 kilowatts FaF97 9. An FM radio station broadcasts radio waves whose frequency is 102.4 MHz. What is the wavelength of these radio waves? A. B. C. D. E. F. 2.82 m 2.93 m 3.04 m 3.13 m 3.22 m 3.31 m 10. Three point charges - Q, +3 Q, and - Q are arranged along a line as shown in the sketch. The electric potential at point P is VP = c P kQ R where c is a constant. The value of c is R -Q +3 Q R A. B. C. D. E. F. -Q R +1.00 +0.879 +1.59 -1.00 -0.879 -1.59 11. When a 1500 W hair dryer is in use, the voltage applied across the dryer may be represented as V= 155.6 sin(120πt) volts. What is the rms current in the dryer? (Note, you are asked for the rms current, not the peak current.) A. B. C. D. E. F. 19.28 A 13.63 A 9.64 A 6.82 A 4.82 A 3.41 A FaF97 A. B. C. D. E. F. 1Ω 3Ω + E` + 12. Three resistors and two batteries are arranged as shown in the circuit diagram. If E1=1 V and E2=6 V, the magnitude of the currents in E1 and E2 are, respectively, E“ 3Ω 0.8 A and 1.4 A 0.4 A and 1.2 A 0.8 A and 1.2 A 0.8 A and 0.6 A 0.4 A and 0.8 A 0.4 A and 1.4 A 13. Two particles of the same mass carry charges Q1=+3.0 C and Q2=-2.0 C, respectively. They are shot into a region that contains a uniform electric field as shown. the particles have the same initial velocities in the positive x direction. The lines labeled a through e, indicate five possible paths for the particles. If the electric field points in the negative y direction, which paths could correspond to a path taken by each of these particles? a y b x c E d point of entry e A. B. C. D. E. F. path a for Q1 and path d for Q2 path c for Q1 and path b for Q2 path d for Q1 and path e for Q2 path b for Q1 and path a for Q2 path b for Q1 and path e for Q2 path e for Q1 and path b for Q2 FaF97 × A. B. C. D. E. F. × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × Magnetic Field (T) 14. A circular loop of copper wire with an area of 2.0 m2 lies in a plane perpendicular to a timedependent magnetic field pointing into the page as shown. The time dependence of the magnitude of the magnetic field is shown in the graph. Which statement is correct? 10 5 0 2 4 6 Time (s) 8 10 At t=1 s the induced emf is 2.5 V; the induced current is clockwise. At t=4 s the induced emf=2.5 V; the induced current is clockwise. At t=4 s the induced emf=5 V; the induced current is counter-clockwise. At t=7 s the induced emf=20 V; the induced current is clockwise. At t=7 s the induced emf=10 V; the induced current is clockwise At t=9 s the induced emf=1 V; the induced current is counter-clockwise. 15. Determine the length of a copper bar that has a resistance of 0.172 Ω and a cross-sectional area of 1.0 cm2. The resistivity of copper is 1.72×10-8 Ω•m. A. B. C. D. E. F. 0.1 m 1.0 m 10 m 100 m 1,000 m 10,000 m FaF97