Physics 30 Dec 06 Diploma Exam

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Unformatted text preview: o answer the next two questions. Cathode-ray tubes (CRTs) are used for television and computer screens. They are set up as shown below. Vacuum Cathode Anode Phosphor-coated screen Deflection coils Electrons are “boiled off” the surface of the cathode and are accelerated toward the anode. The cathode is 4.5 cm from the anode. A potential difference of 2.5 × 103 V exists between the cathode and the anode. The electrons are deflected both side to side and up and down by pairs of magnetic deflection coils mounted on the neck of the tube. 10. An electron hits the screen at a speed of A. B. C. D. 1.0 × 107 m/s 1.5 × 107 m/s 3.0 × 107 m/s 8.8 × 1014 m/s 5 Use the following additional information to answer the next question. An electron is travelling perpendicular to the magnetic deflection coils, into the page, as shown below. Top of screen Deflection coils 1 4 ×– 2 e 3 11. The coils that can produce a deflection toward the top of the screen are numbered A. B. C. D. 1 2 1 3 and and and and 3 4 2 4 Use the following information to answer the next question. A student places a positively charged sphere near a metal rod. Both are on insulated stands and the rod is grounded. ++ ++ 12. X Y The distribution of charge on the rod is A. B. C. D. positive at end X and electrons move off the rod into the ground negative at end X and electrons move off the rod into the ground positive at end X and electrons move onto the rod from the ground negative at end X and electrons move onto the rod from the ground 6 Use the following information to answer the next question. Electrostatic force Force as a Function of Electric Field Strength Electric field strength 13. The slope of the graph represents A. B. C. D. 14. Coulomb’s Law the distance between two parallel charged plates the magnitude of the charge on a particle in an electric field the potential difference between two points in an electric field A photon exhibits properties of a particle because it has A. B. C. D. mass momentum a constant speed a fixed frequency 7 Numerical Response 2. Two microwave transmissions are sent at the same time on different routes to a receiving station. One route is 2 480 km longer than the other. The expected time between receiving the first transmission and receiving the second transmission, expressed in scientific notation, is b × 10–w s. The value of b is __________. (Record your three-digit answer in the numerical-response section on the answer sheet.) 15. An automobile’s battery delivers a steady DC current to a headlight. The electric current in the wire produces a circular A. B. C. D. electric field around the wire magnetic field around the wire gravitational field around the wire electromagnetic field around the wire Numerical Response 3. A wire that is 75.0 cm long carries a current of 6.00 A. The wire is at right angles to a uniform magnetic field and experiences a magnetic force of 0.350 N. The magnitude of the magnetic field, expressed in scientific notation, is b × 10–w T. The value of b is __________. (Record your three-digit answer in the numerical-response section on the answer sheet.) 16. The effective voltage of an AC household outlet is 117 V. The maximum voltage across a lamp connected to the outlet is A. B. C. D. 82.7 V 117 V 165 V 330 V 8 17. Regions of the electromagnetic spectrum listed in order from largest to smallest wavelength are A. B. C. D. 18. X-ray, ultraviolet, visible, infrared, radio X-ray, infrared, visible, ultraviolet, radio radio, ultraviolet, visible, infrared, X-ray radio, infrared, visible, ultraviolet, X-ray Electromagnetic radiation is produced by charged particles that are moving A. B. at the speed of light with zero acceleration C. D. with a changing velocity parallel to a fixed magnetic field Use the following information to answer the next question. In an automobile battery charger, 110 V of household voltage is converted to 14 V DC. The efficiency of the charger is 75%. 110 V AC Battery +– + – charger + – Uncharged battery 19. The initial direct current supplied to an uncharged battery by 0.70 A of household current is A. B. C. D. 6.7 × 10–2 A 8.9 × 10–2 A 4.1 A 5.5 A 9 20. In a certain experiment, the speed of a charged particle is made to increase as it moves at right angles to a uniform magnetic field. A graph that represents the relationship between magnetic force and speed is A. B. Fm Fm v v C. D. Fm Fm v v Use the following information to answer the next question. In 1991, the 18.0 GHz region of the electromagnetic spectrum was used to provide communication links in local area networks (LANs). This led to a dramatic expansion of this region’s commercial use. Numerical Response 4. The wavelength of an 18.0 GHz wave, expressed in scientific notation, is b × 10–w m. The value of b is __________. (Record your three-digit answer in the numerical-response section on the answer sheet.) 10 Use the following information to answ...
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