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Practice Final A solutions

# Practice Final A solutions - ﬂ conducting sphere carries...

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Unformatted text preview: ﬂ conducting sphere carries a net charge ef—o 11C. The sphere is located at the center ot'a conducting spherical shell that carries a net charge n+2 at. Dete'rmine the electric force on a 1 pt} positive charge located at the position marked X, Ill meters from the center of the 3 ~ where “an M + W m cendtwtingsphue 0L PM! W ‘7 ﬁ‘}: "Edi-*3“: - - c conducting spherical Hr I“ rﬂiell X . i #l. ‘1" mid A; gﬂawayﬁcmtheeenter [Ei'ilt‘fr 1 CM“ ) I N toward the center l r; 1 1. 3.6 N away from the center I UllNuthlﬂi E 13rd? \$.ng “if; MG E} ﬁNtowardthe center M F: g £ =i ism") (”s W" WEI} Use the following to answer question}. Two charges ofcpposite sign and equal magnitude Q = 2J3 C are held ll] m apart as shown ET :lELj 7,2 Flame git—LU :QE} r ,2? Determine the magnitude of the electric ﬁeld at the point P. A} 2.2 *109 Wm @515 r 103 Wm C] 4.4 4-103 Wm B) 2.3 * Illa Wm E} 2cm Wm Page 1 Use the following to answer question 3. Theplates of a parallel plate capacitor each have an area of [1.411] In2 and are separatEd 113' a distance of (LUZ rn. They are charged until the potential difference between the plates is Eﬂﬂl} V. The charged capacitor is then isolated. 2.— Suppose that a dielectric sheet is inserted to completely ﬁll the space 1nets-ween the plates and the potential difference between the plates drops to Iﬂﬂﬂ W. What is the capacitance of the system after the dielectric is inserted? 42 H) A) 1.3”“ 10—1“ F .135 EL": . B}2?*]o—1uF Griffin: {is} r 3” a? _.s d§E>i4|¥ “3—10 F lib D) 62*]ﬂ—l” F R :: 53pm r I ' on D ‘---_ ha" __ , a) sane-m F .-. E53 __ U?Xd’_ 9.:3___ _' S ﬂair current is maintained in a simple circuit with a total resistance of 2 51. How much energy is delivered in 3 seconds? Alﬁl Em ﬁrst file : [M12 rm C} 121 a. men @61 . ' (a) 15%: Page 2 Use the following to answer question 5. An RC circuit consists of a mistor with resistance Lt] ks}. a 120—? battery, and two capacitors C] and C3, with capacitances of 29.11} pF and dill] uF, respectively. initially. the capacitors are uncharged; and the switch is closed at r = [lI s. 5 Which of the following best describes the current through the resistor as a function of time? A} It remains constant at 120 not. B It starts at zero and increases logaritlunicallly to a maximum value of 120 IIIJ‘L KC:- E C 4} @t starts at 12E! mr‘t anddecreases exponentially with time constant R{C.+C;} : Bf: H1114) ) it starts at ﬁll this and increases to [Eli malt E} It is zero except for a time R{CL+C1] when it is constant at 1241] me. #61” ' A mass spectrometer is used to separate two isotopes of uranium with masses or. and m; where m; 1* ml. The two types ofuraniurn atom exit an ion source S with the same charge of +5! and are accelerated through a potential difference P”. The charged atoms then cute-r a constant. uniform magnetic ﬁeld B as- shown. If r. = (1.51349 m and r1 = [1.5031 mt what is theyalue of the ratio mllmg‘? - _ __ r 3'. I. -- A4,! : :1 a! :1". til and??? EFﬁ-V’vEW'h-r __ _ . we, ﬁr- £122“ 0': 1—2, iv ' W‘ A} H.9984 . ,r’" H ones? will» :1 mil/t 3W BETH _.____.——— - - ' "'_ _ ' £03312 MU" m a V I 42‘»? a: E} [13?49 : 4*“ : --— T; F 61’s 61,3 M 44.: p (I... W :l - i' Pegs} lair r film )LFfl' . 5:35" 7. Which of the following expressions for the speed of the electron in the hydrogen atom is correct II,r neglecting effects of Special Relativity}? ® y = {l-triZy’rnerllt"2 E :Iih #— 9' B] v = {Gmpg’rjlﬂ r, . l l4 (was no if .i C] v = (lnteZ-I‘orrnp”2 —-—-it t}! . D} e = rfrnc f" k: ‘L l E} Home of these if: 1‘_ m- if 1 if; . E "F" in "" or {on overhead electric power line carries a maximum current of 125 At What is themagnimde of the maximum magnetic ﬁeld at a point 4.5L“! m directly below the power line? . _ﬁ _‘ @sssrmt ﬁrsts.” “7.1mm Hi" —5 ___.__ j __._- __._... a} Ltsrta T 171T ?” Hut" (3} 149* tru-5T _ q or 4.ﬁ?*lﬂ'4T ... If: the i It? E} 195 * la-J T Use the following to answer question 9. A circuit is pulled with a lﬁ-N force toward the right to maintain a constant speed y. Fit the instant shown. the loop is partially in and partially out of a uniform magnetic field that is directed into the-paper. As the circuit moves, a new current ﬂows through a 4.ﬂ‘-ﬂ resistor. KKK!!!” A] The temperature of the circuit remains constant ‘7‘ IE The induced current ﬂows clockwise around die circuit ﬂaw / C) Since the circuit moves with constant speed the force F does zero work. #1.? 9 llt'hich one ot the following statements concerning this situation is true? WW HIM D] if the circuit were replaced with a wooden loop there would he no induced emf. E} As the circuit moves through the ﬁeld the ﬁeld does work to pmduce the current j (' (rt-’7'- wwl‘j‘g, it t’ Page 4 W sw’t’ Ll" Mew It}. A transformer changes 1211] V across the latices)?!»r to [mil in" across the secondary. If the secondaryr coil has Bill} turns‘ how man}.r turns does the primary,r ooil have? :3: W 441% A 40 «an :2} ma o) sac E} acne H0 I " L713 fr) .3! U”- W Use the following to answer question 11. NF ‘75“ A linearlyr polarised electromagnetic wave is sent through two sheets of polarizing material. The ﬁrst sheet. A, is oriented so that its transmission axis makes an angle ofﬁﬂ“ with respect to the incident electric ﬁeld ot‘the wave. The second sheet, B, is oriented so that its transmission axis makes an angle of 90° with the incident electric ﬁeld of the wave. The incident beam has an electric ﬁeld ofpcak magnitude 5.3 and average intensity So. Wat is the peak value oi‘the electric ﬁeld amplitude after it goes through sheet A? A} cause a) asses C} case“ n asses .311]; Page 5 5": GR? F. '1 LutﬁisE . A glass block with an index ofrefraetion of 1.? is immersed in an unknown liquid. A ray 'of light inside the block undergoes total internal reflection as shown in the ﬁgure. Which one of the following relations best indicates what may be eoneluded concerning the index of refraction of the liquid. ”L? A] ”Lem a) m [J C) ”L: 1.3 D ”LSIJ r émslﬁ n13 l~ 3 Wm object is placed in front ofaeonverging lens of focal length 20 em. Tho image is formed 60 em on the other side of the lens. Web entryr in the table below is correct? noise! distant-e magnitude of the in: age height A] 1 ts! [Sern 2cm “if; do Gil-ti m _ . d- F [Sons 4cm tilt? :: _.__ dis-15 C} . seem 4cm 1 - 'Lsuﬁilﬂi _ {we Ce" fﬂ— ’ '_ is. s: -;:e ”S Stir-em Eem . {3e . E) m r r- !r_'- T if“ .‘r ﬁﬂem lem Jo -' HITMlﬂug: (13(q3:<§fh Page :3 Use the Following to answer question l4. The ﬁgure shows the interference pattern obtained in a double-slit experiment using light of wavelength are are. 3:: Central bright fringe 1' 1‘ A E? C D E ,WJTLE‘M m... M IE5. Which fringe is Silt] nm closer to one slit than to the other? A} A In. _ .‘_ .. BlB lg“; 42 ,. WW [ﬂame/01L) C) t: mo E}E H'Whieh one of the following statements concerning the apparent length oFa meter stick is true'?r We apparent length is one meter for all obsrevers. ANT-L ,Bj’rﬂrhe apparent length is greater than or equal to one meter depending on the relative velocity of the observer and meter stick. W [email protected] The apparent length is less than or equal to one meter dependipg on the relative velocity We observer and meter stick. 6" W m he apparent length is different than one meter only.»r if the observer is moving away.r from the meter stiek More of the Elbow: (1(3th W M iw~ Page '.I‘ 16. In an electron difﬁ‘action experiment with graphite, acceleration voltages of lﬁﬂ ‘v' and ﬁﬂﬂ V produces the patterns show. £6 m Mu A... “Mil-L L3 "u? ('9 i‘ha-yb-r /p Which of the following statements best describes what’s going on? ] WREE Alltsatrick W1 Wm M; (514—- AL PM it? E} The eleetrons' deBroglie wavelength decreases wi increasing momentum The electrons are convened to Bremsstrahlung x—ravs which diffract from the graph 5 It f 1p: The pattern on the left Is produced by the lower voltage in the pattern on the right. the central disk must'he dark” Which ofthe followug. describes the transition? A} n-.=2 nr=i t n) n.=l; nr=3 2M 21(i1" ; r?) n-=4' age/2r r” f B "it ' “i1 n.=l; nﬁﬂ/ {a I, I i=4 nf=3 _ ‘ — ? -_ (FE! 'El't .' u?l'ffﬁ_aj(2} {i EJ342914 ) 's .1 (:3! QWES l 18. You are assigned to make a photosensitive material for UV lightthat is not sensitive visible light. Which of the following features is not desirable for your material?I A.) The material is transparent for wavelengths longer than 4Ull nm E} The material has a work ﬁoietion of 4.5 c‘v‘ molecules in the material can he dissociated with [.6 eV photons D] The material ahsorhs light with wavelengths shorter than 4GB nm E) Light with frequency for ltl” Hz oasses right through the materical h ' ﬁx M his question refers to the ﬁgure shown. Which one of the following concepts explains why heavy nuclei do not follow the N = 2 line {or trend} in the ﬁgure? a transmutation W k W é Coulomb repulsion "' C} particleuwave dualityf a: __ _ g D} Pauli exclusion principle W W E] Heisenberg uncertainty principle JET" Consider the nuclear decay process: 915W —s as +3 What istarc] the missing producﬂs}? A} a. photon 74.. C an alpha particle positron-and a neutrino E] an electron and an alpha particle ﬂ isotope of krypton has a half—life of 3 minutes. A sample of ﬂris isotopic produces lﬂﬂl} counts per minute in a lGeiger counter. Determine the number of counts per minute produced after l5 minutes. tj g a a A} 2cm A a " A N r é! ' i ‘r a} Is [3" {‘7' *3 30 k .- fizthﬂll‘l IS—s __ C?” A die" “it rwe e’. ‘ Mai; E] loan :: 3 l. 2 I 424/5 . mien one of the following statements is true concerning the pmto'k; A} The proton cannot be further-subdivided. _ ”#:é ® The proton is composed oftwo'up quarks and a down quark. 7%”: C l The proton is composed of two down quarks and an up quark 77d— D} The proton is composed of a down quark and an up antiquark. ; E] The roton is com oscd of an up quark and a down antiquark. ,r ,I H P p w : 2/5 + as v- A Page 9 L... pereent of all individuals receiving such a doee. If a Stir-kg person were exposed to a dose of //A single.- whole-bod],r dose of 450 rem is eonsidereda lethal dose for approximately ﬁfty feet neturons with on RBE of II]. how much energy hoe the person absorbed? {1 gray=lﬂﬂ I‘a-i | aievert=1ﬂﬁ rent]. '5 R' A] 4an ”50% ' LL 5" 31531 ﬂ 3F F BF. C} 751 BED = Arhﬁdobg 4r- F? . -- _LWr (2 D Sit] N @ﬁ . I Ltfﬁiaﬂ} : E :joj' it? 3% Which of the foliowing ia NUT consen'erd in nuclear and particle interactions? A] The number ot'nueleom-z B} Electric charge T C} Mass and energyr F M “J‘WMLI {FF-J {0'71“- } (54L gridomentum ff- om ,. The number ofeieetrons / . Z If We of the nuclear fusion reactions that oeeura in stars is: i; No + tHe —:- ﬂMg + do where the masses are 3' Ne =.2D.993 349 a; :14»: = 4.Dt}2 603 u;_ ﬂMg = 23.985 [142 u;_ar1d IIII | -. = LDDS HES a. How mueh energyr is released in this reaction? ¢55TMW H.elt:r'260"5 _ 23.6?ﬁ5'at-{2- -} 4.5T2MeV ‘?o it”? 3%“! ‘i J: o} 6.452 Mgr L eﬂ‘i‘rgr o) 3.493Mev E}9.3?ﬂMeV ._ 0:00??W§m : Bar—f? ﬂei/ Page 1 ﬂ ...
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