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Physics 1070

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University of Guelph
PHYS 1070
Melissa Williams

Name (please PRINT, with SURNAME FIRST) ______________________________________ ID___________________________ PRACTICE FINAL EXAMINATION - WINTER 2008 PHYS*1070 Introductory Physics for the Life Sciences I Examiners: M.L. Williams and D.E. Sullivan Allowed aid: Non-graphing calculator. 1. PRINT your name and ID number on this question paper in the space above. 2. Use an HB pencil (= #2 pencil) to fill in the University of Guelph Test Scoring Answer Sheet: • bubble in your last name, and first and middle initials, and print your last name and first and middle initials. • bubble in your student ID number, and print your student ID number in the appropriate spaces. • leave the section number blank • in the E-mail ID area, bubble in your Blackboard USER ID, starting at the left. 3. There are 15 questions (of equal weight) and two formula pages; be sure you have a complete set. 4. Do your rough work beside the questions or on the backs of the question pages. (If you require more blank paper, it will be provided). 5. Circle your selected answer for each question on this question paper and then transfer your answer to the Answer Sheet. This question paper, rough work, and the Answer Sheet will be collected at the end of the examination. Place all sheets insidehe question paper 6. TO AVOID ERRORS (a) Do not mark your answer on the Answer Sheet until you are sure of your response. Minimize your need to erase answers on the Answer Sheet. (b) If you do erase, do it neatly without smudging. (c) Allow at least five minutes before the end of the exam to check your answers on the Answer Sheet. 1. A sound wave travelling in the positive x direction has a wavelength in air of 0.17m and a speed in air of 340 m/s. Which equation below describes this wave? (A) y = 2yo cos (2000t) sin (340x) (B) y = yosin(4000πt + 11.8πx) (C) y = y sin[4000π (t - x/340)] o (D) y = yosin(2000t - 2000x/340) (E) y = 2yocos(4000πt) sin(-2000πx/340) 2. The intensity level 15.0 m from a speaker is 85 db. What acoustical power would pass through a rectangular window (2.0 m x 1.0 m) in a wall at this distance from the speaker? Assume that the speaker is a point source radiating in all directions. -4 (A) 6.32 x 10 W (B) 7.98 x 10 W4 (C) 4.85 x 10 -4W -5 (D) 1.36 x 10 -5 (E) 1.78 x 10 W 3. A 2.0 m long piano string on a piano normally has a primary resonance at 440 Hz, but is out of tune. A piano tuner hears a beat frequency of 5 Hz when a 440 Hz tuning fork is sounded near the string and a beat frequency of 5 Hz when a 450 Hz tuning fork is sounded near the string. Which one of the following statements is true? (A) The first harmonic of the piano string has a frequency of 435 Hz. (B) The second harmonic of the piano string has a frequency of 890 Hz (C) Shortening the string by the right amount will tune its frequency to 440 Hz. (D) Increasing the tension (and wave velocity) on the string will tune it to 440 Hz (E) None of the above statements is true. 4. Which one of the following statements is FALSE? (A) Sound waves are longitudinal pressure waves (B) Light travels very much faster than sound (C) The transverse wave on a vibrating string is different from a sound wave (D) Sound waves can travel through a vacuum (E) “Pitch” in music is closely related to frequency of a sound wave 5. An air filled lens (n = 1.0) ha s radii of curvature as shown belo w. It is placed at an oil- water interface as shown below. What is the optical power of this system? The oil has index of refraction n = 1.8, and the water has n = 1.33. r = 0.3 m (A) -2.2 d oil r = 0.2 m (B) -5.8 d (C) 6.2 d water d-8.0 (D) light 2.9 (E) 6. A person has a far point of 0.75 m and a near point of 0.25 m without corrective lenses. What is their near point while wearing the appropr
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