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Unformatted text preview: Oregon State University PH 202 Winter Term 2012 Midterm Exam 2 (Wednesday, February 15, 7:00 p.m.) GENERAL DIRECTIONS: Fill out the cover sheet completely , as indicatedincluding your test form letter. Follow the specifc directions on each page o the answer orm . Use standard SI units unless directed otherwise; use three signifcant digits in all fnal numerical answers. Questions #1-4 are worth 12 points each; #5-7 are worth 15 points each; #8-9 are worth 18 points; #10 is worth 21 points. Physical constants and other possibly useful information (such as B, your test form letter). g = 9.80 m/s 2 1 atm = 1.01 x 10 5 Pa I = 10-12 W/m 2 1. Refer to the diagram below. At (A) I B = 2 I A . point X, which statement is true? (B) b B > ( b D + 10 dB) (C) Sound from C will be twice as loud to your ears (brain) as sound from A. (D) All of the above. (E) A and B only. (F) A and C only. (G) B and C only. (H) None of the above. 2. In the diagram below, assume for (A) If d = (7.5) l , then B and C produce Destructive InterFerence (D.I.). this question that all speakers are (B) IF d = (4.0) l , then B and D produce Destructive InterFerence (D.I.). motionless and that only the two (C) If d = (0.5) l , then A and D produce Constructive InterFerence (C.I.). mentioned in each statement are (D) All of the above. sounding. At point X, which (E) A and B only. statement is true? () A and C only. (G) B and C only. (H) None of the above. 3. Which statement is False? (A) IF you send the the same Frequency oF sound through 10C air and through 30C air, the wavelengths will be longer in the warmer air. (B) IF a 1-kg mass were oscillating horizontally on a spring oF stiFFness 4 N/m, a pendulum oF arm length 2.45 m would have about the same Frequency. (C) Simple harmonic motion can be described by either the x- or y-motion oF an object in uniform circular motion....
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- Winter '08