old final - Final Exam -Physics 113 - 8:30 AM Section...

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1 Final Exam -Physics 113 - 8:30 AM Section (Lecturer Lafyatis) December 8, 1997 7:30 AM to 9:18 AM 1. Exam is closed book. You are allowed ONE 8.5 by 11 inch sheet of paper (both sides) to assist you. Anything may be written on this sheet. These will not be collected. Calculators are allowed. 2. Write your name and your recitation instructor’s name legibly on each page. 3. The exam consists of: Part A: 2 multiple choice lab questions Part B: 40 multiple choice questions worth 5 points each. 4. Circle the letter of the best answer for each question. 5. The test scores will be curved. 6. Check now that you have a complete exam. 7. You may want to look through the exam and identify problems that appear easy. 8. You have 1 hour 48 minutes for this exam
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2 Name: Recitation Instructor: Part A: Lab Questions L1 (8 pts): In the Photoelectric Effect lab, when a neutral filter was added reduce the intensity of the light, the maximum kinetic energy of ejected electrons: a) increased b) decreased c) was unchanged L2 (7 pts). For the experiments using the MCA, the “channel number” is: a) proportional to the number of counts detected b) proportional to the energy of the detected radiation c) neither of the above.
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Part B: Multiple Choice Questions -- 5 points each 1. What is the frequency of the 3 rd harmonic of a 3 meter rope that is fastened down at both ends? The wave speed for the rope is 5 m/s. a) 0.83 Hz b) 1.67 Hz c) 3 Hz d) 5 Hz 2. What is the frequency of a light wave whose wavelength is 550 nm? a) 1.8 x 10 6 Hz b) 5.5 x 10 14 Hz c) 3 x 10 8 Hz d) 1.8 x 10 -15 Hz 3. Which of the following are longitudinal waves? a) string waves b) water waves c) sound waves d) light waves 4. Wave II has 4 times the intensity (=Power/Area) of Wave I. Find the ratio of amplitudes of these two waves. Amplitude of II : Amplitude of I is: a) 16 : 1 b) 8 : 1 c) 4 : 1 d) 2 : 1 5. Tuning forks of frequencies 572 Hz and 574 Hz are struck simultaneously. What is the beat frequency that is heard? a) 1 Hz b) 2 Hz c) 4 Hz d) 573 Hz e) 1146 Hz 6. The speed of sound is 343 m/s. What is the frequency of the fundamental mode of a 1 meter long pipe that is closed at one end and open at the other? a) 86 Hz b) 172 Hz c) 343 Hz d) 686 Hz 7. A pure tone is used to drive two loud speakers. The loudspeakers are driven 180 0 out of phase (this can happen when you hook the wires up wrong) --- that is, the waves generated at the loud speakers differ in phase by 180 0 . You stand directly in front of the speakers at a position that is 20 feet ( equidistant ) from each speaker. At this position , the interfering sound waves from the two speakers: a) create a node b) create an antinode
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old final - Final Exam -Physics 113 - 8:30 AM Section...

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