001_quiz3 - Physics 1C Quiz 3 Oct 22 2003 Prof Jose Onuchic...

Unformatted text preview: Physics 1C Quiz # 3 Oct. 22, 2003 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Three tuning forks are available. One fork marked "A" produces a 440 Hz tone. The other forks are marked "X" and "Y". The frequency of fork Y is less than the frequency of fork X. When forks A and X are sounded together, a beat frequency of 4 Hz is heard. For forks A and Y. the beat frequency is 7 Hz. For forks X and Y, the beat frequency is 3 Hz. The frequencies of forks X and Y, re3pectively, in SI units,- are closest to: A) 436 and 447 B) 436 and 433 C) 447 and 444 D) 444 and 433 E) 444 and 447 ~ I Situation 1 ' A train is approaching a signal tower at a speed of 40 In / s. The train engineer sounds the 1000 Hz whistle and a switchman in the tower responds by sounding the 1200 Hz siren. The air is still and the speed of sound is 340 In / 3. Ti} 2) In Situation 1. the wavelength of the train whistle tone reaching the SWitCl‘lIIlaIl, in SI units, is given by: _ f"- A) 0.34 B) 0.30 C) 0.33 D) 0.36 E) 0.32 " 3) In Situation 1, the frequency of the train whistle tone. heard by the switchman, in SI units, is given by: A) 1000 B) 330/340 x 1000 C) 340/ 300 x 1000 D) 340/ 380 x 1000 E) 300/340 x 1000 4) In Situation 1, the frequency of the train whistle tone, heard by a passenger on the train, in SI units. is given by: A) 1000 B) 380/ 340 x 1000 C) 300/ 340 x 1000 D) 340/ 300 x 1000 E) 340/ 380 x 1000 5) In Situation 1, the frequency of the tower siren tone, heard by the engineer, in SI units. is closest to: A) 340/300 x 1200 * B) 380/340 x 1200 C) 340/ 380 x 1200 D) 300/ 340 x 1200 E) 1200 6) What is the intensity level in decibels of a sound whose intensity is 10"7 W/ m2? A) 50 dB B) 30 dB (3) 20 dB D) 60 dB E) 40 dB _ .....-._ A—l 7) A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 70 dB to 30 dB. The factor, by which the—acoustic power entering the chamber is reduced by the glass window, is closest to: A)5x10‘4 B)1x10-2 _ ' ' C)'2x10"3 D)1x1o-4 E)5x1o-2 Situation A Ar-Z ...
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