sound and acoustics crossword

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Across
  1. 3. is sound of only one frequency, such as that given by a tuning fork or electronic signal generator
  2. 4. is the frequency of a sound as perceived by human hearing.
  3. 7. object compresses adjacent particles of air as it moves in one direction and leaves the particles of air ‘spread out’ as it moves in the other direction.
  4. 8. frequencies equal to whole-number multiples of the fundamental frequency.
  5. 12. is the distance between any two repeating points on a wave. The unit is the metre (m)
  6. 14. high frequency
  7. 15. A sound wave travels away from its source with a speed of 344 m/s (770 miles per hour) when measured in dry air at 20°C.
  8. 16. low frequency
  9. 17. frequency too low for human hearing
  10. 19. Sound If an object that produces sound waves vibrates 100 times a second,
Down
  1. 1. The mechanical vibrations of sound move forward using wave motion.
  2. 2. is the range of frequencies between any one frequency and double that frequency.
  3. 5. Every object has a natural frequency which is the characteristic frequency at which it tends to vibrate when disturbed.
  4. 6. The nature of a sound wave, such as shown in the earlier figure, means that the vibration of the wave has alternate changes in amplitude called phases.
  5. 9. is the number of cycles of vibration per second. The unit is the hertz (Hz)
  6. 10. in the air with frequencies of vibration which are too low (infrasound) or too high (ultrasound) to be heard by human hearing are also regarded as sound.
  7. 11. frequency too high for human hearing
  8. 13. is the distance moved per second in a fixed direction. The unit is metres per second (m/s)
  9. 18. is a variation in the pressure of the air of a type which has an effect on our ears and brain.