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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 | In which part of the ear is the cochlea? | inner ear | |
| 14 | Of the frequencies listed below, to which one is the human ear most sensitive? 1) 33 Hz 2) 330 Hz 3) 3 300 Hz 4) 33 000 Hz 5) 330 000 Hz | 3 300 Hz | |
| 14 | The air in a tube open at both ends is sent into its fundamental resonance. One end of the tube is then closed and the air column is again set into its fundamental resonance. The resonant frequency ____ after the end is closed. 1) halves 2) stays the same 3) doubles 4) increases by a factor of 1.4 5) increases by a factor of 4.0 | halves | |
| 14 | The density of a certain metal solid is 7.2*10^3 kg/m3, and its Young's modulus is 10*10^10 N/m2. What is the speed of sound in this metal? | 3 700 m/s | |
| 14 | The Doppler shift of ultrasonic waves can measure the speed of blood in an artery. If the frequency of the stationary source is 100 kHz and the reflected sound has a Doppler shift of 200 Hz, what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s.) | 1.5 m/s | |
| 14 | The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.) | 1.7 cm | |
| 14 | The intensity level of sound 20 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.) | 200 m | |
| 14 | The lower A on a piano has a frequency of 27.5 Hz. If the tension in the 2.0-m-long string is 304 N and one-half wavelength occupies the string, what is the mass of the string? | 50 g | |
| 14 | The number of overtones, and their relative intensities, is associated with what property of the tone generated by a musical instrument? 1) quality 2) interference pattern 3) range 4) attack pattern 5) both choices A and C are valid. | quality | |
| 14 | The speed of sound at 0°C is 331 m/s. What is the speed of sound at 25°C? (0°C = 273 K) | 346 m/s | |
| 14 | The speed of sound in air is a function of which one of the following? 1) wavelength 2) frequency 3) temperature 4) amplitude 5) none of the above. | temperature | |
| 14 | The term "timbre" refers to which of the following? 1) Any musical instrument made primarily of wood. 2) The quality of sound from instruments due to the mixture of harmonics. 3) Instruments that have valves. 4) An instrument made in France. 5) None of the above. | The quality of sound from instruments due to the mixture of harmonics. | |
| 14 | Tripling the distance between sound source and a listener will change the intensity, as detected by the listener, by what factor? | 1/9 | |
| 14 | Tripling the power output from a speaker emitting a single frequency will result in what increase in loudness? | 4.8 dB | |
| 14 | Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 500 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s) | 500 Hz |