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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 14 | Two loudspeakers are placed next to each other and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. What minimum distance would one of the speakers be moved back away from the listener to produce destructive interference at the listener's ear? (The speed of sound = 340 m/s.) | 0.34 m | |
| 14 | Two loudspeakers are placed side by side and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear? (The speed of sound = 340 m/s.) | 0.68 m | |
| 14 | Two tuning forks sounding together result in a beat frequency of 3 Hz. If the frequency of one of the forks is 256 Hz, what is the frequency of the other? | 259 Hz or 253 Hz | |
| 14 | Two vibrating tuning forks, held side by side, will create a beat frequency of what value if the individual frequencies of the two forks are 342 Hz and 345 Hz, respectively? | 3 Hz | |
| 14 | What is the first overtone frequency for an organ pipe 2.00 m in length, closed at one end? The speed of sound in air is 340 m/s. | 128 Hz | |
| 14 | What is the intensity level of a sound with intensity of 5.0*10^-10 W/m2? (I0 = 10^-12 W/m2) | 27 dB | |
| 14 | What is the intensity of a sound with a measured intensity level of 84 dB? (I0 = 10^-12 W/m2) | 2.5*10^-4 W/m^2 | |
| 14 | What is the intensity of sound from a band with a sound level of 120 dB? (I0 = 10-12 W/m2) | 1 W/m^2 | |
| 14 | What is the lowest frequency that will resonate in an organ pipe 2.00 m in length, closed at one end? The speed of sound in air is 340 m/s. | 42.5 Hz | |
| 14 | What phenomenon is created by two tuning forks, side by side, emitting frequencies, which differ by only a small amount? | beats | |
| 14 | What sound level change corresponds to a factor of two change in intensity? | 3 dB | |
| 14 | When a sine wave is used to represent a sound wave, the crest corresponds to: 1) rarefaction. 2) condensation. 3) point where molecules vibrate at a right angle to the direction of wave travel. 4) region of low elasticity. 5) None of the above. | condensation. | |
| 14 | When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)? 1) perpendicular 2) parallel 3) anti-parallel (in opposite direction) 4) Both choices B and C are valid. 5) None of the above. | Both choices B and C are valid. | |
| 14 | When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference? | one-fourth of a wavelength | |
| 14 | When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.) It is open at both ends. 2) It is closed at both ends. 3) It is open at one end and closed at the other end. 4) Any of the above could be true. 5) This wave pattern doesn't exist. | It is open at one end and closed at the other end. |