MT2ESol - Oregon State University PH 202 Midterm Exam...

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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 indicated—including your test form letter. Follow the specific directions on each page of the answer form . Use standard SI units unless directed otherwise; use three significant digits in all final 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 E, your test form letter). g = 9.80 m/s 2 1 atm = 1.01 x 10 5 Pa I 0 = 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? (F) A and C only. (G) B and C only. (H) None of the above. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 3. Refer to the diagram below. At (A) Sound from A is louder than sound from C. point X, which statement is false? (B) You hear a higher frequency from B than from D. (C) Speaker C is more powerful than speaker D. (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. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 4. Which statement is false? (A) If you send the the same frequency of sound through 10°C air and through 30°C air, the wavelengths will be longer in the warmer air.
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