final_sol - Physics 2020—002 Name: Kai Final (A) — 5...

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Unformatted text preview: Physics 2020—002 Name: Kai Final (A) — 5 May 2010 Part A: Hard Multiple Choice (20 points total, 2 points each, Circle Best Answer). 1. A proton (q = +6) ‘feels’ a force of 1.73 X 10‘12 N from another charged particle when it makes a closest approach of 20.0 11m. What is the charge of this other particle? a) 2.21 x 10-11 c b) 1.60 x 10—19 C c) 1.126 d 3.00e e) 13.68 2 Fr} a (L73)!IOWWNB<zDiD>HDM7Ms$ 6:913 313:: a 1 -— 4:80X/5'qc = 3056- \F“ 3 9r1 3231‘ (beau/D'WB 7:9?“0 “ML/€13 . 2. An alpha particle has a charge of 2.00 6. How much work is required to move this alpha particle across a potential difference of 2270 volts? @454 lieV b) 13.6 eV C) 270 X 10—30 J 2 4.734 929V A 'a d) 2.34 x 10-2 J e) 1.07 x 103 J _ '«Ié ' [9V] 3 J _ , .- m y A ._ : W»9}A\/~ (axltozxro c)(g;i7o\1> - 7117x/D Q x lawn/64%. LI.§LI>(/o e 3. A parallel—plate capacitor has a capacitance of 124 pF when air exists between its plates and 702 pF when a dielectric exists between its plates. What is the dielectric constant of this dielectric? a) 0,177 b) 2.44 ' @566 d) 13.6 C ‘ C‘KODS K: E; = 4. A potential drop of 12.6 V is experienced in a resistor when 2.24 mA of current is flowing through this resistor. What is the resistance of this resistor? e) 8.70 x 104 a) 28.2 mi 5) 5.63 0 c) 282 0 5630 0 e) 9660 0 \/ . _.A 1; (av :gflng/Ogfl \/ = ’2 — - a . - A “L > I 3'14 y/o 3’1‘4 5. A RC circuit has a time constant of 0.222 s. If the resistance in this circuit is 988 Q, was is the capacitance of this circuit? @225 /./.F b) 219 F c) 2.11 11F d) 0.473 F e) 0.00 F ’1‘“ 0. 7.111: f :P" - "" “4“ T'RC l2 ’ ciggfz/ ~92,le/0 ,- :d'ggg’flf: PHYS-2020-002: General Physics II —— Final (A) — 5 May 2010 Page 2 6. A light beam travels in the air and encounters a glass surface. If the incident angle is 527° and the refracted angle is 127°, What is the index of refraction of this glass? a) 1.52 b) 2.65 @562 d) 4.67 e) 7.98 ~ - ~ me in. 5.2.7” ‘ M a '= _: l . ._____,__’- Z' O, 1 7. A lens forms an inverted 4.55 cm image of a 1.22 cm erect object. If the image forms 62.2 cm from the lens, how far in front of the lens is the object? a) 1.75’cm b) 16.7 cm C) 22.2 cm (1) 32.6 cm e) 232 cm -1.=-;‘i_ =-~i:~ 62.1% “12” ._ 7 M J f if W ( >C-4-55'm) ' M" M 14 8. The index of refraction of 421.0 nm blue light is 1.721. What is the wavelength of light beam if it has an index of refraction of 1.488? a) 688.2 nm b) 333.6 nm @4869 nm d) 520.2 nm e) 450.9 nm .44 . : 2 ..J— ... f» 77—, - ml), //\rL Ml ._ W Xl-Illaom " 9. An object is 1.24 in from a lens and its image is 0.345 in from this lens. What is the absolute value of the magnification of this image? a) 45.6 b) 15.4 C) 3.59 Cl) 0.888 e) 0.278 03‘ng M1: 20.27% 10. An object With a height of 4.20 cm sits 46.6 cm from the reflecting side of a plane mirror. Which of the following best describes the image? cm ._ (9 1 46 b 1 f1 142420 Virtual image t lat is .6 cm in acc o t 1e mirror. _ p: 4 My Om (MO 7% B b) Real image With a height of —4.20 cm. a \ c Virtual image With a height of —2.10 cm. None of the above. ) d) Real image 46.6 cm in front of the mirror. 6) PHYS-2020—002: General Physics II — Final (A) — 5 May 2010 Page 3 Part B: Easy Multiple Choice (20 points total, 1 point each, Circle Best Answer). 11. For an ohmic device, as temperature increase, what also must increase? a) capacitance b) charge @esistance d) current e) inductance 12. Which of the following devices, by itself, can be used to measure the amount of current flowing through a circuit? a) voltmeter b) ohmmeter c) capacimeter alvanometer e) calorimeter 13. Kirchhoff’s loop rule is nothing more than a conservation of a) polarization b) conduction @nergy d) momentum e) charge 14. Lightning will occur when what happens? a) The potential between a cloud and the ground exceeds 13.6 V. b) An occluded front stalls over water. c) For every Avagodro’s number of electrons in the ground, there is an Avagodro’s number+l neutrons in the cloud. (9 The cloud / ground E-field exceeds the dielectric strength of the air. e) A coronal mass ejection occurs on the Sun. 15. Who discovered the effect of self-inductance? HM a) Faraday b) Lenz c) Maxwell (1) Ampere @none of lese 16. Which of the following intensity levels could be heard by humans without suffering damage to the eardrum? a) 412C113 b) —12.2 dB @32 dB d) 150 dB e) 1200 dB PHYS-2020-002: General Physics II — Final (A) — 5 May 2010 Page 4 17. \Ne observe 5 different blackbodies and note the type of light that each emit their maximum amount of flux. Of these, which is the hottest? @fltraviolet 18. Any mass that obeys Hooke’s law will follow what type of path/motion? a) red 0) green (:1) infrared e) microwave a) parabolic trajectories b) circular orbits ) c elliptical orbits cl) imple harmonic motion e) no motion, it remains at rest 19. Which of the following is true about plane waves? hey are spherical waves that have traveled a long distance. b) They increase in power as they cover more distance. 0) They increase in power as they travel from a medium with a lower index of refraction to one with a higher index. d) Their frequency increase as they travel. e) They do not exist in nature. 20. What does the principle of causality demand? @The Universe is determinate —— for every effect, there is a cause. b) The Universe is probabilistic— all future happenings are based in probability. c) Newtonian mechanics does not accurately describe the workings of nature. d) Boltzmann thermodynamics does not accurately describe the workings of nature. ) e None of these are correct. PHYS-2020-002: General Physics II + Final (A) — 5 May 2010 Page 5 21. Who interpreted a light wave as a series of spherical wavefronts where each point on the circumference of a given wavefront acts as a point source which generates a new spherical wavefront which propagates outward? @Huygens 22. Reflection off of a rough surface is known as what kind of reflection? @diffuse d) matte a) Einstein b) Planck c) Faraday e) Maxwell 13) specular c) glossy e) shiny 23. The law of refraction also goes by the name of b) Newton’s law 0) Coulomb’s law nell’s law 24. Light of different wavelengths being refracted at different angles is an effect known as ispersion e) scattering a) Maxwell’s law d) Wein’s law a) diffraction c) interference d) polarization 25. The ratio of the speed of light in a vacuum to the speed of light in a material is called the @mdex of refraction d) index of reflection b) opacity c) transparency e) conductivity 26. A transparent surface with fine parallel lines etched on it causes light to be dispersed when it passes through this surface. Such a device is called a rating a) galvanometer b) radiometer c) prism d) lens 27. Who performed the double slit experiment? b) Newton e) Galileo a) Huygens c) Lenz (a Young PHYS-2020-002: General Physics II — Final (A) — 5 May 2010 Page 6 28. The optical phenomenon known as a mirage occurs as a result of What principle of optics? a) diffraction d) interference b) reflection @refraction e)' polarization 29. Newton’s Rings result from What principle from optics? a) diffraction @interference b) reflection c) refraction e) polarization 30. The objective of a reflecting telescope is often called a(n) a) eyepiece d) magnifier @ primary mirror e) drunk c) secondary mirror PHYS-2020-002: General Physics II — Final (A) — 5 May 2010 Page 7 Part C: Problems (40 points total, 10 points each). 31. An object sits to the left of a lens at a distance of 74.2 cm. An inverted image is formed on the right of the lens that is 2.88 times the size of the object. (a) Where is the image formed with respect to the lens (in cm) and is it real or virtual (Why)? (b) What is the focal length of the lens (in cm) and is this a diverging or converging lens (Why)? (Show all work!!!) ,2 __ LB FL+%VL—l:—ir-———+‘—I—‘ :l’ M Wg>o):fiim fl , WWW; PHYS-2020-002: General Physics II — Final (A) — 5 May 2010 Page 8 32. Monochromatic coherent light is passed through a double slit forming an interference pattern on a screen 82.4 cm from the slits. The separation of the slits is 0.552 mm. A second order bright fringe forms 2.33 mm from the central maximum on the screen. (a) What is the wavelength of this light in 11111? (b) At what angle (in acrseconds) would this fringe be located as viewed from a point directly between the two slits? (Note that 1° = 3600 arcsec. Show all work!!!) :o.w:2°x 3900?”; 2 533m PHYS-2020—002: General Physics II — Final (A) — 5 May 2010 Page 9 33. A doubly—ionized alpha particle (q = +26, m = 4771p) is moving in a uniform parallel electric field in a direction opposite of the electric field. When measurements commence, it has a kinetic energy of 56.4 MeV and it continuously decelerates to a stop. If it moves 6620 km during this time, What is the strength 6., absolute value) of the electric field? (Show all work!!!) . _ -9 9596 ; 904002 mo [90> : 3,1D4X/D If. 1 ~27 M:4Mf:4(f.(p7lK/Ov7 S: é.[p$%X/D % 17/ , é - __, [<50 2 m m x I” 8% 1303212,; 2 mg ,0 '3, [59 Med K130 : at My; A); ; WE : 1(9.03§x10"%§ \ ) M (DI {I’D—7.7% . z 02 ( aims wok/LB ) 27C ZKéJa 2x mt”) ’1 — Qa'O‘IlX/DZ 4M/JLZ PHYS-2020-002: General Physics II — Final (A) — 5 May 2010 Page 10 34. The capacitor circuit in the attached figure has an 18.0 volt battery connected to capacitors with the following capacitance: 01 = 24.6 ,LLF, 02 = 14.2 MF, and 03 = 36.2 ,LLF. (a) Find the equivalent capacitance (in MP) of this circuit. (13) Find the charge (in n0) on each capacitor. (Show all work and a_11 figures in reducing this circuit!!!) 01 C) Q1 ~ Ca =94 C5 Li 9-7- : /L’,z(/HT: + PHYS-2020—002: General Physics II — Final (A) — 5 May 2010 Page 11 Extra Credit Problem (5 points each, do this only if you have time). 35. What is the kinetic energy (in eV) of the Balmer-series electron of hydrogen (Z = 1)? (Show all work!) L M: 'nffltzl/QzeQ/(Me‘rmB 3 M “Mela/L V 2— _:1M %9_€:B_ i 9268 fl2m 6905’JL9MM13/% 5L 8 mew,“ ' 3 m \ .. Z KE; i ( ‘Z‘iflqoz’uxlrml/c2 (/ éDLx/o 95 z- ./ 'lfif \/ : flax/D KW : 3,40et/ 36. In the future, a telescope will be launched into space that can just barely resolve the stellar disk of the bright carbon star TX Psc at 1200 nm. If the angular size of TX Psc is 9.31 inilli—arcsec, What Will be the diameter of this telescope in meters? (Note that 1° = 3600 arcsec and ‘milli’ E 10—3. Show all work!!!) QM : 1.7.2 1 /b 72 = KlnEIX/DVBWX I X rm 3éCOaJLcJuz¢ Zéoo : 57 Y meg I ,, ~‘i b 2 law Em 4.5} X/DJZ WM? : lag»! ml ...
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final_sol - Physics 2020—002 Name: Kai Final (A) — 5...

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