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Tom Henderson

### Studying Suggestions for Refraction Quiz #1

The first sound quiz will be on Friday, January 10. The quiz will be a one-page quiz, covering both sides of a single sheet of paper. Bring your calculator and be ready to think and diagram. Students can expect the following concepts, skills, and problem-types to be assessed on this quiz:

1. An understanding of the nature of a sound wave as a mechanical wave whose vibrational motion forces particles of the medium to vibrate longitudinally, thus creating regions of high pressure (compressions) and low pressure (rarefactions).

2. An understanding of the physical properties of sound waves such as the amplitude, frequency, speed, wavelength, and intensity; an ability to perform relatively simple computational problems involving wavelength, frequency, speed, and period; an ability to use the deciBel scale to relate the intensity rations of two given sounds.

3. An ability to relate the intensity of sound and the deciBel level to distance and power; an ability to use the inverse square law to predict the effect of varing distance upon sound intensity and deciBel levels.

4. An ability to use the speed = distance/time equation in order to solve computational problems involving the echoing (i.e., reflection) of a sound wave off a barrier.

5. An understanding of the Doppler effect and shock waves; an ability to relate the conical angle for a shock wave to the mach number.

6. An understanding of the concepts of natural frequency, forced vibration, and resonance; an ability to relate the resonance mode (or harmonic) of a guitar string to the standing wave patterns established by waves within that system; an ability to relate the frequency and/or wavelength of the the fundamental (first harmonic) to the frequency or wavelength of the other harmonics of a vibrational system.

7. An ability to solve a standing wave problem for resonance in a string, including the ability to determine the speed of the wave if the tension and mass per unit length information are known.

E-mail: Tom Henderson || Last update: 12/11/2002