finalv1ans - 0001-1 Final Physics 1240 Spring 2010 version...

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0001-1 Final - Physics 1240 – Spring, 2010 – version 1 SIL difference (in decibels) Intensity ratio 1 dB 1.3 2 dB 1.6 3 dB 2.0 4 dB 2.5 5 dB 3.2 6 dB 4.0 7 dB 5.0 8 dB 6.3 9 dB 7.9 Bubble in questions 1-40 ON YOUR BUBBLE SHEET! 1. What is the period of the note A4 (concert A)? A) About 440 seconds B) About 2.3 seconds C) About 0.78 seconds D) About 78 milliseconds E) About 2.3 milliseconds 2. A mass hanging on a spring wiggles up and down in simple harmonic motion. If you double the mass, how do you predict for the frequency of motion to change? A) It will go UP by a factor of 2 (new frequency is double the original). B) It will go UP, but not by a factor of exactly 2. C) It will go DOWN by a factor of 2 (new frequency is half the original) . D) It will go DOWN, but not by a factor of exactly 2. E) It will stay the same, frequency does not depend on mass. 3. Which of these statements best describes the way a microphone works? A) The sound particles in the air travel into the microphone, where they strike a membrane and transform into electrons; the electrons create an electrical signal. B) Inside the microphone is a very small antenna which detects the electromagnetic wave in the room and amplifies it to create an electrical signal. C) The sound wave in the room causes pressure variation on a small membrane inside the microphone; the motion of the membrane is converted into an electrical signal. D) The microphone takes an electrical signal and converts it into physical motion of a small membrane, creating a sound wave. 4. I have a speaker with a diameter of 50 cm. Which sounds will head out primarily in the forward direction from the speaker, and which will spread out in all directions ? A) Frequencies above about 7 Hz will go forward, and frequencies below about 7 Hz will spread out. B) Frequencies below about 7 Hz will go forward, and frequencies above about 7 Hz will spread out. C) Frequencies above about 700 Hz will go forward, and frequencies below about 700 Hz will spread. D) Frequencies below about 700 Hz will go forward, and frequencies above about 700 Hz will spread. E) None of the above is a good description of which sounds will head forward and which will spread.
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0001-2 5. A plane flies toward a stationary siren at ¼ the speed of sound. Then the plane stands still on the ground and the siren is driven away from it at ¼ the speed of sound. In both cases, a person sitting in the plane will hear the same frequency of sound from the siren. A) True B) False 6. The just noticeable difference (JND) of hearing is larger for softer sounds. For example, a 1 kHz sound that starts at 80 dB has a JND of about 0.5 dB, while the same 1 kHZ sound that starts at 30 dB has a JND of about 1 dB. Which statement below best describes the interpretation of this experimental result? A)
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This note was uploaded on 08/24/2010 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.

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finalv1ans - 0001-1 Final Physics 1240 Spring 2010 version...

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