Across
- 3. loudspeakers, guitar strings, vocal cords
- 4. relationship is true for all wave motions
- 6. high frequency
- 8. the unit is metre per second
- 10. 880 Hz
- 12. low frequency
- 14. when natural frequency is disturbed
- 16. frequencies equal to whole-number multiples of the fundamental frequency.
- 18. frequency too high for human hearing
- 19. horns, organ pipes, mechanical fans
- 20. frequency too low for human hearing
Down
- 1. the frequency of a sound perceived by humans
- 2. 440 Hz
- 5. the unit is the metre
- 7. the vibrations of sound moving forward
- 9. the unit is the hertz
- 11. the distance between two repeating points
- 13. the distance moved per sec in a fixed direction
- 15. variation in the pressure of the air
- 17. 1320 Hz