physics_final - finq‘ ’ ' F‘ 1 An object is moving...

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Unformatted text preview: finq‘ ’ ' F‘ 1 An object is moving in one dimension only. If the uncertainty (standard deviation) in its momentum has a magnitude of 4.00 X 10—6 kg-mls, what is the minimum Jpossible uncertainty in its position? 2 CA: 2.65 x 10'39m QM?- t J EB: 6.03 ><1027 m fix (Howa- t, 1 317g: A, _. ‘i 00 no“ lID: 3.79 X lOZBm __ a.” “0.3L: ‘3:- EE:’ Noneoftheabove k______ am : 1.3M}; ‘l ‘00 mo '6 2 The physical law that describes the electrostatic force between two point charges is CA?” thn's law. _7 ' Coulomb’s 1a? cc: afiyififi" CD: The Biot—Savart law. CED Lenz’s law. 3 At a certain frequency, a certain capacitor has a reactance of 3.00 .0. If an ac current of 4.00 A amplitude (peak value) flows through the capacitor at that frequency, what is the amplitude (peak value) of the ac voltage across it? VHR Mrs» BIL v = (3)0” :11. CB: 1.33v V cc: 0.7sov XL ' ‘f‘ £004»? :40” v; tutti-t CD: 36.0V CE =1 None of the above 4 Light of wavelength 600 nm is normally incident on a double slit. An interference pattern is seen on the other side of the slits. If the angle between the central maximum and the first-order‘maximum is 60.0“, how far apart aretheslits? r: -r A” clgkno _._,fi m _ l EA: 520nm L9, (, =3: lOnm \ “it, \(toonm) ~_ ‘1 Sin no I2G:| 1390nm \ “ A c :D: 346nm W- Cl CE =1 None of the above 5 Which is a vector? can elecn'ic’p/otenfial CB 2' mgnetieflux @yfgfialso known as magnetic flux density) CD: electric, charge r2E3 electrigesistance 6 A person with a near point distance of 25.0 cm uses a converging lens of focal length 9.00 cm to attempt to magnify some fine print. If the image he views through the lens is infinitely far away, what is the angular magnification? . \" A” E? T” 6 I. C“? W- : = EB: 2’78 H} k/ q (V'h CO: 6.62 CD3 14.1 ':E 3 None of the above l/ 7 The capacitanCe of a pair of conductors is defined as E EA: the potenfialW the conductors divided by the current flowing from one to the other. CB:l the amount of charge that can be transferred from one conductor to the other. l:C:I the nonelectrostatic work per unit charge that is performed in transferring charge from one conductor to the other. the ct charge on either conductorrdittitledbythe lIE3 the charge per unit time that flows from one conductor to the other. 8 A certain electromagnetic wave traveling in a vacuum has an intensity of 2.00 Wlmz. Suppose the amplitude of its electric field intensity oscillations is tripled (i.e., increased by a factor of 3). What will be its new intensity? CA: 0.667 Win32 1"?» gt (9 7 : Li 1 M v '— ' '33:1 0.222 Win12 lo ’ ‘ 557—1 - IQ . b a a-e-a mp oL-‘pe .5“ «k 8'0 W’mz _' - era «that» I=E=I Noneoftheabove of— ?) . 9 The electric charge am in a box at time t is given by 4(1) = (4.00 Clsz) r2. What current flows into the hex at time t = 5.00 s? . h‘ 1C —"""' EA: 125 A ~ T; { ED2 167 A cE 2' None of the above 1 O In a certain one-electron atom, the first excited (n = 2) Bohr orbit has aradius of 0.235 A. What is the radius of the second excited (n = 3) Bohr orbit? :A: 0.352 A h, a a 3"." #533 0.104 A % (Rica 0ng A co: 0.157 A |=E =1 None of the above ,i— -q '1 (L: 1 1 The decay constant of a certain radioactive nucleus is 0.300 s“. If 4.00 X 10“5 undecayed nuclei are present at time:=0,howmanyremainattimet=5.005? A: ems—t wrap“ .93x105 fl ADMIN, - :B: 2.40x 105 ' M ED:- W105 2427 x13": CE:l None of the above 12 Who explained blackbody radiation by hypothesizing that the energy of vibrating atoms cannot vary continu- ously from zero to infinity but, instead, is quantized? CA3 Einstein :83 Bohr EC: Rutherford ED: deBroglie E 3.319119 1 3 Suppose there were a uniform elgtric field of 3.00 NIC pointing vertically upward in this room. If the tabletop at the front of class has an area of 2.00 m2. what wouidbe the electric flux through its surface? CA: 150 N-mllc _r ' can 0.667N-m21C F 9 '3 “Ni” SEAR :c: 0.750 Nanle 1;; mg «5.50%? :0: 1.33 N-m2/c («ffifiwfione of the above (zoom: «.9st T—o 1 4 A infinitely long wire carries a current of 4.00 A horizontally toward the north. What is the magnetic induction atapoint3.00mwest ofthe wire? 7 q A CA: 2.67 x 1041', toward the east _.~. A01 ___ 9n rid'li) : —1T u -- ,3”; 3 an - 11:3 CO:1 1.68 x 10“ T.towardthenorth »_ 15'] x ,0“? CD: 1.68 x 10'6 T, toward the west i . .L 149.2- l=E=l None of the above ‘ amp “'1 15 When light of a single wavelength is incident on a single slit, and a screen is on the opposite side, a pattern is formed with a large central bright fringe and alternate dark and bright fringes on each side. This phenomenon is called A Efirflgdifiiraction. ‘> :35 resolution. EC:I refraction. 1 6 The magnetic flux inside a singlelgo _of wireincreases from 2.00 Wb to 6.00 Wb at a constant rate for a time of 3.00 5. During that time, fihficmrJlis induced ifithe wire? CA3 9.00v r3; WV 6:6 __/_ 453/ :B: 12.0v D '/ l (W cc: 36.0V — 4Q) _ :0: 133 £ 325’ :9, r: E :1 None of the above 1 7 In formulating his four integral equations describing the relation between electric charge, elwmc_mene elec- trichelds and magnetigfields, Maxwell came up with a new quantity that made his equations more Symmetric. That qumitity is required for his equations to predict the existence of electromagnetic waves. What is that quantity? EA: magnetic flux EBII electric flux CC:I magnetic monopole ED: electrical impedance /, ————‘ @ilisplaoement j 18 The potential difference between the piates of an ideal parallel place capacitor in a vacuum is 12.0 V. If the plates are 0.0300 m apart, what is the magnitude of the electric field intensity between the plates? can 0.360Vlm C; éc A; V719 : “L: ca: 1.33 x 104 Vlrn ' or :4 @E E3 : ‘32" : ctoo . I=D=1 2.50 x 10‘3 Vlrn -o?ao -—— I:E :1 None of the above 19 A light ray moves through water (index of refraction = 1.33) in an aquarium generally downward but in a direction 40.0“ from vertical. The bottom of the aquarium a thick plate of transparent material with an index of refraction 1.80. What is angle the angle between vertical and the light ray in the glass plate? mra‘mea 2 mb shoe, “2"” NW (_ t EB: ' ‘ $1. nqo LL81: mine CC: 53.1“ CD: 12.2“ (0 Age“ CE:I None of the above 20 What is the equivalent resistance of 3 600-0. resistance and a 4.004). resistance connected in parallel? EA: 1.50.“ (p q __ M an S}, '13: 0.6670 6+4 ’0 ' l1C:l 10.0.0. g" :D: 2.400 r CE; ‘None of the above ! PHYS 202 (Sec. 2) Final Examination May 4, 2000 INSTRUCTIONS NOTE: YOU LOSE 5 POINTS IF YOU FAIL TO FOLLOW ANY OF THESE INSTRUCTIONS. 1. 2. 3. Answer this test on the furnished SCANTRON card (or its equivalent) using a #2 pencil. In the blank labeled “NAME” on the SCANTRON card, print your name. Read the directions in the box labeled “IMPORTANT” on the SCANTRON card. Note that you must erase pencil marks completely when changing your entries. Following the instructions in the box labeled “PART 1" on the SCAN'I‘RON card, write your nine-digit ID number in the appropriate spaces, starting at the top row. Code your ID by marking through the correct numbers as instructed. The bottom row in the ID box should be left empty. Each question in the attached test has a corresponding row on the SCANTRON labeled by the question numbers “1”, etc. Mark through the letter on the SCANTRON card corresponding to your answer for that question. You lose 10 points for each question in which you mark a wrong answer, no answer, or more than one answer. In numerical problems, mark an answer if it is within 10% of your answer. When you are through, double check your marks and erasures! Also, be certain your answers are in the rows corresponding to the question numbers on the test. Turn in only the SCANTRON card. If? d r ‘u’ .l R '3': jljr/‘A : L403: 1 Three current-carrying wires run through an open window, creating a magnetic induction B(r) at the window frame, where r is a position on the window frame. If the closed path integral p B - air is evaluated around the window frame, the result is 4.00 X 10‘5 T-m. What is the absolute value of the net current flowing through the three wires? CA3 5.02 X 10‘11 A EBB 31.8A EC: 3.14 X 10‘2A CD:| 4.52 X 10‘6A CE :1 None of the above l}; -. Mu I (EMA/Q Kit? A“- 2 The impedance of an ac circuit is expressed in what units? lfi!’ ohms all" Wk: EBB val-ts I “.13...- 5C3 farads ED:l seeands l:E 2' inverse-seconds 3 A surveyor is using a magnetic compass 8.00 m below a horizontal power line in which there is a steady current of 200 A. What is the magnitude of the magnetic induction at the site of the compass due to the power line? CA: 3.93 X 10—6T _.———-M° I ‘fn we" (:00 A‘) 533 3.l4 X 10—5 T . 2”“ -O- 5.00 x 10’6T CD3 6.25 x 10'7T l2E3 None of the above 4 The uncertainty (standard deviation) in the position of an electron is given as 8.00 X 10'” in. What is the least uncertainty (standard deviation) in any simultaneous measurement of the momentum of this electron? Ii- 6.59 x 10-25 kg-mfs ax asp ~ 1}; “t: EB: 5.28 X 10‘35 kg-m/s 503 6.37 x 10‘5 kg-mls CD: 1.43 x 10—25 kg-rnfs '2 E 3 None of the above 5 The statement, “The integral of the electric flux over a closed surface equals the net charge enclosed by that surface divided by the permittivity of vacuum, ” is known as EAII Ampere’s law. EBI! Maxwell's law. *0- Gaussf law. |ID:1 Faraday's law. CE 3 the Biot~Savart law. 1 1 Two point charges of 4.00 C and 3.00 C are separated by a distance of 5.00 In? What magnitude force does each exert on the other? F; J— (it can Ll 994: 4.32 x mm we. r... :B: 2.16x10'0N CCj 2.12 X 10‘” N 1934.25 X 10"2N IIE3 None of the above 1 2 A metal plate is illuminated with light of a certain frequency. Which of the following determines whether Or not photoelectrons are emitted by the metal? ' CA3 the intensity of the light CB :1 the length of time of exposure to the light : CG:I the thermal conductivity of the plate t. r .03 CD: the area of the plate a“ the material the plate is made of 1 3 In a certain electric field, the potential V at position (x. y, 2) depends only on x and is given by 4.00 V- 2 Va) 2 U[ I- U)? '0!’\ Mth i denoting a unit vector pointing in the positive x—direction, what is the electric field intensity at the position = 9 x 3.00 m. 0‘ ~— CA: E = —(0.444 Vlm)i C: r l E an as -e- E = 4(0143 V/mJi cc: E = (0.0494 V/m)i _.>CD3 E = (0.296 V/m)i CE 2' None of the ab0ve 14 When an candle flame is placed 20.0 cm in front of a lens, an image of the flame is projected on a screen 50.0 cm behind the lens. What is the absolute value of the focal length of the lens? CA3 70.0 cm . _ é— * If; : J; EB3 30.0 cm .7 _ '- _, tea 33.3 cm HI ’ “"""5~"—‘3~4l. ' I it + E15 T1D: 37.5 cm ——9= E31 None of the above 15 We showed in class that, at any point in an electromagnetic wave traveling through vacuum, the magnitude of the electric field intensity is equal to the magnitude of the magnetic induction multiplied by a constant. What is that constant? _ 1Ema-the speed of light in vacuum '— 13 Q EB:I the permittivity of vacuum CC3 the permeability of vacuum CD3 Planck’s constant EE 3 the magnitude of the electronic charge 1 6 What is the potential difference across the 9.000 resistance in the circuit below? 9.000 v= R T :A: 6.67V U’CPJJS'Zt’ .357 a) was 7.71 v cc: 0.857 v ,2 con 10.5V f4 ““ '357 CE: None of the above any 1 7 Total internal reflection sometimes occurs when light traveling in one medium meets an interface with a second medium. In order for this to occur, which must be true? U CA II The incident ray must move along the normal to the interface. I:33 The first medium must be air. . . . _ C CD:I There must be a reflective coating on the 1nterface. n. ‘ m The speed of light in the second medium must be greater than in the first medium. 1. A metal rod is falling vertically at a certain location on the earth where the earth‘s magnetic field has a induction of 5.00 X 10—5 T pointing horizontally to the north. The rod always points in an east-west direction and has a length of 3.00 m. When its speed is 20.0 m/s, what is the absolute value of the emf induced across the rod, and which end is positive? g {3: 30 A “gs N (I: 3100 U1 “Mm/5 CAI! 3.33 X 10‘4 V, east end positive l:B:l 3.33 X 10'4 V, west end positive HOE! 3.00 X 10‘3 V, east end positive lIDS 3.00 X 10*3 V, west end positive IIE 2‘ None of the above 19 A film of water of index of refraction 1.33 lies on a horizontal flat surface of glass of index of refraction 1.50. The thickness of the water film is 600 nm. Light of a continuous range of wavelengths from far infrared through far ultraviolet travels vertically downward in air and is incident on the water. What is the longest wavelength of this light that can be strongly reflected upward from the water film with constructive interference? Express your answer as the wavelength of the light in water. “fa k . CA3 2400 1,33 U9 __._ a If “m .n A ._._> CB: 1200nm 4051...? "L [.5 y: a A; EN 600 nm ED:I 900 nm 1IE 3 None of the above 2. The inductance of a certain coil is 0.500 H. If the current through it changes at a rate of 800 A15, what emf is induced across the coil? _ ‘ I ‘ alt-smoov é' '5’ .7 EB: 400v ’7 . cc: 1.60x105v My 7 :D: 2510v ' I: E 3 None of the above SCRATCH SHEET Information you may or may not need: gravitational acceleration near earth = 9.80 W52 magnitude of electronic charge = 1.60 X 10‘19 C mass of electron = 9.11 X 10'31 kg mass of proton = 1.67 X 10‘27 kg permittivity of vacuum = 8.85 )5 10'12 F/m permeability of vacuum = 4n X 10—7 T-mlA speed of light in vacuum = 3.00 X 108 m/s Planck’s constant = 6.63 X 10‘34 J-s {5,1,4 L, 5 P MN? 26905" Dem jot... 1 Which is hue? _ . - CAD The focal length of a spherical mirroris twice its radius of curvamre. ', _ I: B 21 A spherical mirror. can never produce an image that is larger than the object. I: C3 The greater the radius of curvature of a spherical mirror, the shorter its focal length. C D3 mirror that is flat and not curved cannot produce an image. ' @e image produced b5! 3. diverging (convex) spherical mirror is always virtual. ‘/ 2 Consider a series RLC ac circuit. The amplitude of the voltage across the circuti divided by the amplitnde 'of the current through the circuit is e impedance of the circuit. ' 1 I: 8:! the tangent of the phase difference between the voltage and the current. ' Z : R Jr [XL ” V A C C3 the resonance frequency of the circuit. ‘/ |‘—' E:i always zero if there is no resistance in the _circuit. ' E D3 always equal to the resistance in the circuit. 3 A metal plateis illuminated with light of a certain frequency. Which of the following determines whether or not photoelectrons are emitted by the metal? ' ' e intensity of the light / 7 r I: B D the length of time of exposure to the light v E Oil the thermal conductivity of the plate I I=IIJ'—" the area of the plate I: E3 the material the plate is made of 4_ Total internal reflection sometimes occurs when light traveling in one medium meets aninterface with a second medium. Inorderforthistooccur.whichmnstbetrue? - 7 ' ' E A3 The incident ray must move along the normal to the interface. C BII The first medimn must be air. =2 CI! The index 'of refraction of the second medium must be greater than that of the first medium. V’- = D3 There must be a reflective coating on the interface. ' @e speed of light in the second medium must be greater than in the first medium - -‘-I?hersta£ement, “The integral of the-electric flux over a closed smface equals the net charge enclosed by that surface divided by the permittivity of vacuum, " is knownas - EA: Ampere’s law. ' *er 1' Maxwell’s law. @uss’ lan/ .I=D=I Far'aday‘s law. ' E E:I the Biot—Savart law. showed in class that, at any point in an electromagnetic wave traveling through vacuum, the magnitude of the ' field intensity is equal to the magnitude of the magnetic induction multiplied By a constant What is that constant? _ ' i ' - - CAI! the speed oflightin vacuum Eli}:l the permittivity of vacuum E : KC, I: C: the permeability of vacuum ' 7 'C D: Planck’s constant ‘ c E 5 the magnioide of the electronic charge 7 Three current-carrying wires run through 'an open window, creating a magnetic induction B(r) at the window frame, where r is a position on the window frame. If the closed path integral fi B - dr is evaluated around the window frame, the result is 4.00 X 10'5 Tall. What is the absolute value of the net current flowing through the three wires? 3 : M0 Leo-(low; z-Uflx’b-1>(:Wtiwr/\ '1 Dir/0 ’57:“ co: Ajax 10*5 A " CE:I Noneofthe above / . 8 An optical microscope is used in such a way that the final image is infinitely farfrom the user, who has a near point distance of 25.0 cm. The focal-length of the eyepiece is cm. If the absolute value of the magnification of the objective lens is 15.0, what is the absolute value of the overall magnification of the microscope? - - CA3 6.67 t: :1 ‘ J.) " . ' a 750 p out, , QR’» CO: 3.33 ML) 1 CD: 0 i , C E:| None of the above 9 The resistivity of copper is 1.69 X 10‘8 (1-111. What is the resistance of a copper wire of length 500 m and cross section area4.00><10‘5 m1? ' 7 K ; Pi cA3‘1.35><10“5.fl f5 My? Y (10'? v t it :3: 106.0. ~ .0.- . m 59:, .0-.?..1_l_9.‘/- ' 12: 590m 7 I X :E: None of the above ' M 1 O A film of water of index of refraction 1.33 lies on a horizontal flat surface of glass of index of refraction 1.50. The thickness of the water film is 600 um. Light of a continuous range of wavelengths from far infrared through far ultraviolet travels vertically downward in air and is incident on the water. What is the longest wavelength of this light that can be strongly reflected upward from the water film with constructive interference? Express your anew-er as the wavelength of the light in water. ‘ 7/? can lZOOnm , __._7I:B= 240011111/ 2 1 1 A +5.00-C charge locateci 8.00m west of a ~5.00~C charge. What is the electric field intensity (magnitude and direction) at a point midway between the two? . CA: 3.51x103 NIC; west X ' _ i A,» X ‘ ' A ': ($7 (,4 g m D can 7.02x108N/c,we'st‘>< ' g : ..._...._—-—- _ .— _”‘ cc: 5.62x109N/c,east X _‘ 2450 K E; . 3 / - 6 =53“ 0 '2 2| Noneoftheabove . _ 21760 _ 1 2 A surveyor is using a magnetic compass 8.00 m below a horizontal power line in which there is a steady current of 200 A. What is the magnitude of the magnetic induction at the site of the compass due to the power line? .cAn 3.93 x 10-6 T '53: 3.14x 10-51“ /. ccu'sooxw-‘T. - . 7 ‘_ 3 EDI! 6.25 X 10-7 T r.- E: None offlie above W ‘ — O 1 3 ha certain electric field, the potential V at position (x, y, z) depends only on x and is given byte—"'- cen E = —(0.148 VIm)i c c: E =; (0.0494 Vlm)i co: E = (0.296 mm ./ :3— ' ' "I When an candle fiam_ s placed 20.0 cm in front of a lens, an image of the flame is projected on a screen 50.0 cm behind the lens. What is the absolute value of the focal length of the lens? 7 ‘ :A: 70.0 cm ' 53330.0cm' } + J _____/__ {Ecz’rsas'cm' ' - ’9 '7 5 14 ____..t 14M? x“;- :13: 37.5 cm oh w w M some“ 15 What is the potential difference across the 9.004) resistance in the circuit below? Vcr) __ 4.00 V'mz _ R i I _ x2 - . . With i denoting a unit vector pointing in the positive x-direction, what is the electric field intensity at the position x = 3.00 m? a ' a ‘f . . ' I - . ' = _ . ' / - k ‘ '“' a- r‘ ‘- 0 EA: E. fl 7-?” .__ . L. 9.00 ‘3: EA: 6.67V J.»— I i W 5.009. I cc: 10.5v E E:1 None the above J 12—0 V : t ‘ . _ 1 6 A thin, nonunifome charged rod of length L extends along the x—axis of a coordinate system from x = 0 to x =. L. 7" ' The linear charge density (charge per unit length) it at position x on the rod is given by l = Cx, where C is a constant. Taking the electric potential to be zero at infinity, derive an expression for the electric potential at the ' origin (x = 0) in terms ofthe stated quantities (and physical constants, of course). 1C cA=V(0)=T-— _ _' . 7 5], e j.- . 4601; ‘ 1&3 )K v Lilléo r . l B: V(0)=-——HCL . ' ' three, - . fl: . ,J/ IA 7 ~ v-mo I , an: “0):;(1 V “L CK ' Ck; 8 22760 S ' E E3 None of the above (“T60 1 7 The uncertainty (standard deviation) in the position of an electron is given as 8.00 X 10'11 m. What is the least ’ uncertainty (standard deviation) in any simultaneous measurement of the momentumof this electron? CA3 6.59 x 10-25 kg-mls _ _ 7 ' Q flue: 5.23x10-35kg-m/s A? . AX > h AP " (Ki-IA 2 (W43. 5 5" , cc: 6.37 x 10’5kg-mls __-- ..-— - WT to: 1.43 x 10-26 kg-rnfs ~ . LI ’fl‘ ‘ CE: None of the above 1 8 A metal rod is falling Vertically at a certain location on the earth where the earth’s magnetic field has a induction of 5.00 x 10'5 T pointing horizontally to the north. The rod always points in an east-west direction and has a length of 3.00 tn. When its speed is 20.0 mls, what is the absolute value of the emf induced across the rod, and which end ‘ is positive? . . :A: 3.33X10—4V,eastendposifive I r W, 7- {‘00 6 Is. 7/ :3: 3.33 x 10‘4‘V,westendpos_itive Eil/b L I Hi ’6 , V 5 i : .5 M E (33 3x 10‘3 V, east end psitive _ -I/ 2 20 ~/ 5 : n a 3.00 x 10 v, wesnd positive ./ C E:I None of theabove 19 Light of wavelength 500 nm is incident on a nan’ow slit. The angle between the first difiraction minimum on one " Eidéfif the central maximum and the ' on the other side is 3.00". What is the Width of the slit? ' EA:I 26.2 are A EC3'13.1nm Ash/t 6 5 V” :0: 9550mm ./ ' ,N >CE:1 None of the above 20 The inductance of a certain coil is 0.500 H. If the current through it changes at a rate of 800 Ala, what emf is induced across the coil? CA3 IGOOV ' _______55_=_n69_x_105 v”? é H» L $00 A. cc: 2510V ' —' . S "=4oov _ 5 r 2, 7' ’ Tate - m 1 w C E 3 None of the above ...
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This note was uploaded on 03/01/2012 for the course PHYS 202 taught by Professor Johnmeriweather during the Spring '09 term at University of Louisiana at Lafayette.

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physics_final - finq‘ ’ ' F‘ 1 An object is moving...

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