VIBRATION
Quiz 1
1. An oscillation is a sound wave that is always periodic in its waveform. T or F
2. Which is not a unit of frequency?
A. cps
B. kHz
C. Hertz
D. mel
3. The frequency of a periodic waveform varies inversely as its period and wavelength, that is, low frequencies have long periods and wavelengths, and high frequencies have short periods and wavelengths. T or F
4. The wavelength of a periodic wave with a 500 Hz frequency will be approximately:
A. 10 ft or 3 m
B. 5 ft or 1.5 m
C. 2 ft or .7 m D. 1 ft or .3 m
5. The speed of sound increases with air temperature, and therefore wavelengths of the same frequency will have shorter wavelengths. T or F
6. In a standing wave, the pattern of nodes and loops is fixed. T or F
7. The nodes of a standing wave are positions of ________ movement.
A. maximum
B. simple harmonic
C. little or no
D. periodic
8. The fundamental mode of a string fixed at both ends increases in frequency as the string lengthens. T or F
9. In a string fixed at both ends, or a tube open at both ends, length L, the wavelength of the fundamental mode of vibration is _________.
A. 1/4 L
B. 1/2 L
C. L
D. 2L
10. The modes of vibration of a string or pipe are called:
A. oscillations
B. harmonics
C. inharmonics
D. eigentones
11. Frequencies above 20 kHz are termed __________, whereas sounds with energy below 20 Hz are termed infrasound. T or F
A. VHF
B. supersonic
C. subsonic
D. ultrasonic
12. The perceived distance between two pitches is called an _________ .
A. difference tone
B. interval
C. bandwidth
D. absolute pitch
13. WIth musical instruments, such as the piano, both the timbre and the perceived sie of intervals will vary according to the various pitch ranges of the instrument. T or F
14. All musical intervals may be defined in any of the following ways, except one, namely __________ .
A. frequency ratio
B. their scale position
C. cents
D. their position in the harmonic series
15. The interval of the tempered fifth is defined as the ratio of 3:2. T or F
Index
home