exam_1_t_th - tn PHYS 122 EXAM 1 October 1 2009 Prof S.M...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tn PHYS 122 EXAM 1 October 1, 2009 Prof. S.M. Bhagat Name: 52’}; L a '1'th (Sign in ink, print in pencil) Notes 1. There are six (6) problems in this exam. Please make sure that your copy has all of them. ' 2. Please show your work, indicating clearly what formula you used and what the symbols mean. Just writing the answer will not get you full credit. Instating vectors, give both magnitude and direction. 3. Write your answers on the sheets provided. 4. Do not forget to write the units. 5. Do not hesitate to ask for clarification at any time during the exam. You may buy a formula at the cost of one point. Take Care! God Bless You! [“0 2 477x104 T—me- _ ~12F 80—9X10 Ac Mass ofproton mp = 1.6 x 10—27 kg Mass of electron me = 9 X 10‘31kg Elementary Charge 6 = 1.6 ><10—19 C Problem 1a A mass is acted upon by a force E = Cxfi, where C is a positive quantity. Will it exhibit linear harmonic oscillations? Justify your answer. - (6) N0, VL‘” wr'l/ ”MN” seaming-v W&'raficrm , (W . Mg) 6»? Wm MH' :1 WE? €24? (JWH.??3M'”£‘ 11.9 j at. 335(3)» ”Wows (yam mama) ax e: an» away» wwmsiay Ska i 2 in 7’3 kWh. . “‘73? u- ‘ a,» I ...- Lat” w ' M a -» “’ :7h/ 6 g {m 65 VIEW 8,de “Lam/4% 7’23) (”£1 “a ‘74" To 311'7‘01/5 flag: ‘3L‘:C9 . Problem 1b In the experiment on a simple pendulum why do you need the amplitude to be small so it will Show linear harmonic oscillations? (10) ”We jean/em WW? m W “MM Wig, A. WWW” — My»? (fill/:53 mWfl‘flM T“ flaw»? WE 5hr”? {Qrgwgtpr-‘fl M S WTI Vi ”Univ,” Maggi/33mg Ma‘amfi rm 4&2; flv’kfi ' A F'— u. .6 M, ,réitm“5? ”Z” a *5” .. I?” eg‘ W73: (A, wire mew mambym 4%., WW ‘ , M 1 a +41m5£wwfifl fag; L5 QM, fidv‘m ”oh/1M" M 5 2 5 Am mWM’lmh'A-W ~13» v.3 I£‘”WL~E’&¢£ epwwew “13%., Anijsfelétcwammb. (”wk Lil/(‘5' 45W #Memvu: (51. [email protected]&" 2/ CREME $1M 459:: @ 41mg} WTW @“W A ff: “ M? 52 "’7 m. 2;. w M .5; *5”? @ W‘fl'w 51% Ma. Imimgaféa ‘imal .45: a: 5? ‘mflgu/QMM ‘ Nam “$7— 30 fiWlflzfi‘Mfl-é 7H1 Wfifi/fififiwmwfitj’flmmfl Problem 2a What is a travelling wave? (6) ‘ A dw'a/h'om C 33) gamma 43W” (yr/um (xv/“£4,244 ‘57 an. —FM mafia» fizg k «>141, 7027:1'I‘7‘amfm7) Away, flu“; [1-) CW 5mm «2:, MbamafiL “KW M“ Kama! 2:“ WMflWL 7““: W" ’a'fMMJEi’QM m M Wi|mwffifAV$ (9:,ng “9225.50 D mmww M $WWWW¢J+ W) ’q Wamgg am we Wmlm w r an we, a g, (14%» Problem 2b As written below, there are quantities missing on the right side of the equation D : ...sin(x—vt) where D is a physical quantity (displacement, pressure, .,.) x is a length V a velocity And t a time Justify the quantities you insert and in each case explain their physical significance (10) 73:3 {5 mi FEYga‘aM, luff? mama Lam Wmewfil‘éwsi 6M6 fiaulii'm "5 MM Mauwlewgs «5'0 W'fl MM i“ C‘mewm :4 5’“ W» mm” ”- Lt lea-”Mine W‘mmafir'fimé 3% 1:9 “mm-wt a) 4am A W3 . Wig New: mead; j) flail/W" Wk“? CW 4" mfimfiu I "5: (fiJIIV‘AflaA/‘giawm' ”€17 MfiLLmanf/w Wit-Wind «24“ W W SHACK gt'ma VS If>WfifiCMfi MW é’NVdW‘M‘W <37‘13» W113; A SM 211% [X‘rvfj 1 3" as Problem 3a A wave is written as y = 0.05(sin 6.28): 005112.560)? _. . m 5 14/ Sm (meanflwmtfl‘g where lengths are in meters and times in secs, Is this wave (i) longitudinal or transverse? (ii) Travelling or stationary? Calculate its i) amplitude ii) wavelength iii) frequency. (3,3’3’4’3) LT) WM{ l5 "Th/“W Mawm lb eiflirwfi ' - flask was: g (if) IF” If cSFMbmm/fiv- (Decimé'e at“ 31:!) mm: “flail/mat? /2. "" €33 1* £3 53% Problem 4a What is sound? (6) “17/ (M Whamifla/A home, m egg gfiwwflwgfl% [I‘m W,wfigfim 2.23 H :2: amaze 24> MHZ: Cam '34.. fifwmméwgeummi wwg Problem 4b The velocity of sound in a gas is written as kaT m Why is there a 7/ in this equation? V (10) Sarguwd 11$" 252.“. WK‘DMameW Lowe. fl; Mfiplamawwwé~ a; a; We Mama of warm, Emma w; «a 013(ng (v) mm 91;? v MWW, wwwtflg, (P) Wwfiffirfi WW, h M64 We MW win Wow em ”W’mmswwp mmm P 41%;; V; §|‘wm firms 0% SAIAMM L5 Wfimm mm 29);»!23 W VMIMe‘M Me My 44:75:39 am? wwfifgflg; Law (‘5 m mwemM-efe “g 11.21.“, mmé’fi 5W4; tvauwewcgfi Mm.“ $53,720 mam“ Pwafi V; W3: immfié, & W Pi meg; L432”; P v Mgfafifa flew?» e216 6‘ * WY; flame MW 1%; 9237 DAED . . _ 6V Problem 40 What is the speed of sound on the moon? (The moon has no atmosphere) (4) mm, WWJQ :15 My.) Kemmm «SM WWW. W What is light? ‘ ‘ (6) I Llfi/evt" L5 '51; fifi'umfvma élWL‘WAWa‘ {1wa Wayne th’“ 5 9’14ng W V6“: Mum... U5 3% 1p gflw/g dew/L LQ‘/%fim WW¢me=arm$ f“ VMMMM- Me: 4npmm< A7, (gabwm. Problem 5b You are sitting 2m away from a 100 watt bulb (efficiency for light emission 2.5%). What is the amplitude of the E—field in the electromagnetic wave entering your eye? Why? (10) m )1." Mfg wt“ 2 MWM g 1—— p w M? WWW/m '1’“ " ”25%?“ 47W 9/ » Problem 6a Show that when light from two identical but incoherent sources arrives at a detector, the total intensity is just twice of that due to one source. (14) EWLSJS‘WJM %fl§aMw Cmva‘lUM QWWMALM qufl (AW-0M»: lam“ maygz, lemme cits?“ Ymvw/iirem cw CHM‘ " TWa- WWW , J , V w -> ”" ‘ n with. 1 La" .—. am so; (multwwcp’) 5E2” Embw( x , 5w???) ’ ( 1:12: “lei-f épQ EM") 5’ u , i ‘2. ’52» ‘ 52> Lama. “M m‘mflal’lh‘wmva 25m qfitfiflfln; “”4. (WWW? ”a“ '2'... 2n '2'; . . a But Lg 5%me m t‘méfzsbmwfiwll“ (511?, “3%) (*5 Vamttmfiélm w, ”Mme 5;? all? maieolfia mewwe <1") $4.5; fir}, 4Em3£<<2m1< @1355) EM“ . ”2“ ' Problem 6b (CZJZW keg: 52> (twat £9 46%: 1%: 2 I", If the two sources in problem 621 were coherent what would you observe‘:7 Why? (6) ilfi we «{er fiemvem %V% (Atwmlwréffim'w i=2. 4,; “’- ‘nggv ['2'ka tat lave gm 3, I. a; 4%; $56, «a; £fi$cfi @Dgfmfi) bu“), Cluzwg’a) ”Wale-0 Umwwlezw l MMflLLMW grill??? «:3 a“ l ”“9” W W‘l' {M l V Mahfi‘m WWQML [$34 43” (”A WWfi 4.1.». “a We, 5?} mm emu, r mug pi» Mmmw m ewwe mimicry; deem W #ffgenwtemg 9W raw. ewe waM/a m m. Jé’nmm, TM arm“ smarts n1, Amman“ mm “QM" WLW 5,15%er w Z) A W A 10 ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern