GENERAL PHYSICS PHYS 2002
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This 6 page Class Notes was uploaded by Alverta Blick III on Tuesday October 13, 2015. The Class Notes belongs to PHYS 2002 at Louisiana State University taught by D. Young in Fall. Since its upload, it has received 10 views. For similar materials see /class/222998/phys-2002-louisiana-state-university in Physics 2 at Louisiana State University.
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Date Created: 10/13/15
PHYSICS 2002 Practice Final 1 Instructions a Print your name and student number below then sign your name as it appears on your LSU ID card Fquot Print and bubble in your name LAST NAME FIRST student number and section number on the scantron provided c When you hand in your paper be sure to put it in the stack labeled with YOUR INSTRUCTOR s NAME AND THE CORRECT EXAM FORM PRINT NAME KEY STUDENT NUMBER SIGNATURE SECTION INSTRUCTOR Section 1 840 7 930 MWF Young Section 2 140 7 230 MWF Johnson Section 3 740 7 900 TTh Goodrich Section 4 140 7 300 TTh Slovak Throughout this test directions left right up down in out are referenced to the plane of the page Good luck and have a great summer Physics 2002 1 Spring 2002 Louisiana State University Dept of Physics amp Astronomy 1 An electron is held fixed at a distance of l m from the nucleus of a uranium atom Z 92 If the electron is then released what is the magnitude of its initial acceleration a 98 ms2 b 1250 ms2 c 20000 msz a 23300 ms2 e 46000 ms2 2 The third Balmer line Hy is seen in emission when an excited htydrogen H atom has an electron move from the 5Lh energy level E5 054 eV to the 3r level E3 340 eV What is the wavelength 7 of this line a 4101 nm b 4347 nm c 4861 nm d 6563 nm 3 A current of 2 A is maintained in a simple circuit with a total resistance of 2 Q How much heat is generated in 3 seconds a96J b24J c12J d6J e3J 4 A circuit including 4 resistors is connected to a battery as shown What is the equivalent resistance of the circuit 3Q SQ SQ a 129 b57Q c 112 2 d 92 Q l V 5 In the problem above if V 12 volts how much power is dissipated in each of the 5 Q resistors a 12w b 68W c 46W d35W e57W 6 An electron is accelerated from rest through a potential difference of 17000 volts What is the nal velocity of the electron a 244 x107 ms b 296 x107 ms c 514 x107 ms a 773 x 107 ms 7 An electron is accelerated from rest through a potential of 100 V What is its deBroglie wavelength a 0034 nm b 0123 nm c 0382 nm d 0973 nm Physics 2002 2 Spring 2002 Louisiana State University Dept of Physics amp Astronomy 8 A wire runs through a 07 T magnetic eld as shown The dashed lines represent the magnetic eld and the solid black line the wire The angle 9 indicated is 30 degrees The force per unit length on the wire is 035 Nm What is the magnitude of the current through the wire Direction is unimportant here gt a 058A b 071A A i B c 14A d 24A I 39 e 10A 9 In the figure below a sliding conducting rod is being mechanically pulled to the left along two conducting rails that are connected at one of their ends through a resistor R A uniform magnetic eld B is applied into the plane of the page throughout the area enclosed by the rod rails and resistor According to Lenz39s law what is the direction of the current around the loop formed by the resistor the rails and the conducting rod a clockwise b zero current ow c counterclockwise d both counterclockwise and clockwise e insuf cient information to tell 10 A circular loop is in a magnetic eld m the page as shown The magnetic field is decreasing with time In which direction does the induced current ow a There is no current i i i X X X i bClockwise c Counterclockwise X X X d Inthe page X X X e Out ofthe page X X X X X X X X X X X X X X X X X Physics 2002 3 Spring 2002 Louisiana State University Dept of Physics amp Astronomy 11 Current in a power line runs from south to north At a point directly below the power line what is the direction of the magnetic eld created by this current a south b east c west d up e down 12 A convex lens a converging lens has a focal length of 200 cm If it is used to View an object at an in nite distance away what is the image distance a 010 m b 020 m c 020 m d 7010 m e none ofthese 13 Cobalt60 60Co is often used as a radiation source in medical applications It has a halflife of 525 years Ifa patient is injected with a 052 ug sample of 60Co how much of it will be in their system after 211 years a 014 ug b 026 ug c 039 g d 046 Hg 14 Four identical looking faceted gemstones are claimed to be diamonds A smart buyer knows that the critical angle inside a diamond with air surrounding it is 244 degrees smaller than all other hard transparent substances She aims a laser carefully into each gem so that it strikes the gemair interface as shown at an angle of 280 degrees Which one is the diamond The dashed line is the normal at the gemair interface a b 50 Questions 15 17 A candle ofheight 23 cm is placed 100 cm to the left ofa concave lens of with a focal point that is 65 cm from the lens w 4 15 The image formed by the lens is best described by which of the following a real to the left of the lens magnified b Virtual erect magnified c real inverted reduced d virtual t0 the left of the lens reduced 16 The image distance is a 394 cm b 1857 cm c 394 cm d 1857 cm 17 The magni cation m is a 7394 b 0394 c 394 d 0394 Physics 2002 4 Spring 2002 Louisiana State University Dept of Physics amp Astronomy 18 A particle carrying a charge of 7 45 uC initially moving horizontally enters a region of space between the plates of a parallel plate capacitor which are separated by a distance of 5 X 10394 m see gure Apotential difference V 17500 volts is applied across the plates If the particle follows the path shown which plate is at a higher potential and what is the magnitude of the electrostatic force that acts on the particle upper plate 158 N l lower plate 158 N pmgcle T upper plate 008 N V 5 x10394 m lower plate 008 N upper plate 88 N 33853 19 A photon of energy E 64 X 103919 J gives ALL of its energy to an electron in a metal so that the photoelectron leaves with 11 eV of kinetic energy What is the work function W0 of the metal a 29 eV b 13 eV c 065 eV d 017 eV 20 A tungsten W target is bombarded by electrons accelerated through a potential of 60 kV What is the cutoff wavelength of the Xrays emitted from the target a 207 x 10 11 m b 207 x10398 m c 207 x 10396 m d 207 x10394 m 21 Two straight wires parallel to each other carry currents of 11 20 A and I 30 A in opposite directions The wires are separated by a distance of 035 m Left Right IlT ll gt 035m 4 What is the direction and magnitude of the force per meter acting on wire 2 a 343 x 10396 Nm left b 343 x 10 6 Nm right c 245 x 10396 Nm lef t d245 x 10396 Nm left 22 If the ionization energy for hydrogen H is 7136 eV what is the energy of the level with principal quantum number n 3 a 7136 eV b 7089 eV c 151 eV d 7456 eV 23 The electron in the hydrogen H atom can be viewed as orbiting the nucleus a proton in circular orbits of increasing radii What is the radius of the third electron orbit a 0356 nm b 0478 nm c 0875 nm d 0973 nm Physics 2002 5 Spring 2002 Louisiana State University Dept of Physics amp Astronomy 24 A concave mirror forms a real image 55 cm from the mirror when an obj ect is placed 75 cm in front of it What is the focal length of the mirror a 194 cm b 254 cm c 317 cm d 552 cm e 684 cm 25 A proton with a speed of 60 X 105 ms moves in a circular orbit in the magnetic eld of the earth If the strength of the eld is 50 X 10395 T what is the radius of the orbit a 527 X 10396 m b 0068 m c 0752 m d 250 m e 125 m 26 The total energy density joules per cubic meter u of an electromagnetic wave is given by the expression where E strength of electric eld B strength of magnetic eld 80 electric permittivity of free space and Ho magnetic permeability of free space The intensity S of light is de ned by S cu where c speed of light What are the SI units of intensity S a W b Wm2 c J d Jmz e none ofthese 27 The following fusion nuclear reaction takes place in the core of the sun it is called the protonproton chain 4H gt He 2e energy where is e a positron a positive electron The atomics masses of H and He are respectively l007825u and 4002604u and the mass of a positron is 0000549u What is the energy released in this reaction Recall that lu 16605 X 103927 kg a 213 x103912 J b 412 x 10 12 J c 474 x103912 J d 585 x103912 J Physics 2002 6 Spring 2002 Louisiana State University Dept of Physics amp Astronomy
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