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p125-f-w03

p125-f-w03 - University of Waterloo Final Examination...

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University of Waterloo , University of Waterloo Final Examination Sprine TERM 2004 (Tenn) (Year) INSTRUCnONS: PART A: 6 multiple-choice questions worth 5 markseach QUESTION GRADE .7 8 a) ANSWER CARDS WILL BE COLLECTED AT 11 :30 a.m. b) Mark your card in dark pencil. Avoid erasures by checking answers before marking them. Enter your ID# and the lecture section indicated above in the spaces provided. c) A TfEMPT ALL QUESTIONS - thereis no penalty for incorrect answers. However, credit may be denied if appropriate work is not shown in the space below the questions in this booklet. d) Numbers in questions may be taken as accurate to as many figures as you wish, but answers are rounded, so pick the closest one. 9 10 11 PART B: 7 questions worth 10 markseach for an overall total of 100. 12 Partial credit is given for a correct approach providedyou show clearly what you are doing. ,13 Diagrams are not to scale. TOTAL USEFUL INFORMAllON: Density of air = 1.29 kg/m3 Hearing threshold 10 = 10-12 W 1m2 hc = 1240 eV.nm h = 6.63 X 10.34 J.s mc=9.llxIO.31kg e=I.6xI0-19C -136 En= -i- eV (Bohr theory for hydrogen) n g = 9.8 m/s2 c = 3.00 X 108 m/s 1 eV= 1.6 x 10-19J mp = 1.67 x 10-27 kg mHydrogen Atom :=::mp Area of sphere = 47tR2

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Physics 125 Final Examination Page 2 of 12 I. The wave function for a travelingwave is given asy(x,t)=2.5sin(I.05x-27rt). Where xand y are in cm. and tin seconds. Find the transverse speed (in m/s) at a point where x=I.50m. and t = 1.20 seconds. (a) 0.11 (b) 0.23 (c) 1.56 (d) 0.71 (e) 1.12 2. A speaker at the front of a room and an identical speaker at the back of the room are being driven at 456 Hz by the same oscillator. A student walks across the room from one speaker to the other at a constant speed of 1.5 m/s. How many beats per second does the student hear? Use 340 m/s for the speed of sound of air. (Do not consider the interference of the sound) (a) 1 (b) 2 (c) 3 (d) 4 (e) s CARDS WILL BE COLLECTED AFTER 2 1/2 HOURS
Physics 125 Final Examination Page 3 of 12 3; Two thin lenses made of glass having different refractive indices n) and n2 are held together. The 1 st lens has one flat side and one concave side of radius R. The second lens has two convex sides of radius R (neglectthe distance between the two lenses). For an object far

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p125-f-w03 - University of Waterloo Final Examination...

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