Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Name _______________________________ Date __________ Chapter 21: Sound 1. The loudness of sound comes from the _______________ of a sound wave. 2. The _______________ of a sound is how you hear its frequency. 3. The range of frequencies humans can hear is from ______ Hz to __________ Hz. 4. The sound of the human voice contains ______________ of different frequencies. 5. A graph that shows the different frequencies in a sound is called a _______________ _______________. 6. The loudness of a sound is measured in _______________. 7. Fill in the following decibel chart. 0 dB 10-15 dB 30-40 dB 45-55 dB 65 dB 70 dB 90 dB 100 dB 110 dB 120 dB 8. The human ear is most sensitive to sound between _____ Hz and ________ Hz. 9. An _______________ _______________ curve compares how loud you hear sounds of different frequencies. 10. Sounds near _______________ Hz seem louder than sounds at other frequencies. 11. The science and technology of sound is called _______________. 12. The speed of sound in air is around _______ meters per second ( ______ mph). 13. Objects that move slower than sound are said to be _______________, while those that travel faster than sound are called _______________. 14. A supersonic jet causes a cone-shaped _______________ _______________ to form. Right at the shock wave, you can hear a _______________ ____________. 15. Sound travels about _______ times faster in water than in air. 16. The shift in frequency caused by motion is called the _______________ Effect. 17. The Doppler Effect only happens when the source is _______________. (subsonic or supersonic) 18. A microphone transforms a sound wave into an _______________ signal. 19. An analog to digital converter measures the electrical signal _______________ times per second! The numbers are recorded as data on a _______________. 20. In order to play the music back, you need a _______________ to _______________ converter. 21. A _______________ recording is two recordings, one for the left ear and one for the right. 22. Sound is a _______________ wave because the air is compressed in the same direction the wave travels. 23. When music is playing, the cone of a speaker creates a _______________ _______________ of alternating high and low pressure. 24. In air, the _______________ of a sound wave is carried by moving molecules. 25. When air is cold, the speed of sound _______________. 26. If the air pressure goes up, the speed of sound _______________. 27. The speed of sound is _______________ in helium, which is why your voice sounds funny if you inhale helium. 28. The wavelength of sound is _______________ related to its frequency. 29. A long tube makes a _______________ frequency sound, while a short tube makes a _______________ frequency sound. 30. To make a high frequency sound on a guitar string, you need to make the string _______________ (longer or shorter?) 31. Reflected sound and direct sound create a multiple echo called ______________. 32. Reverberation also causes _______________ of sound waves. 33. _______________ _______________ are areas where _______________ interference causes sound to cancel with its own reflections. 34. Spaces enclosed by boundaries can create _______________ with sound waves. 35. In a closed pipe, the closed end is a _______________ in the standing wave, while the open end is an _______________. 36. The wavelength of the _______________ is ______ times the length of the pipe. 37. Almost all the sound you hear is a combination of _______________. 38. _______________ theorem says that a wave of any shape can be made by adding up _______________ frequency waves. This is based on the _______________ principle. 39. When you hear a sound, the nerves in you ear respond to more than _______________ different frequencies at the same time! 40. Your ear is a living application of _______________ theorem; it separates the sound into different _______________. 41. A _______________ _______________ is a graph showing the different frequencies present in a sound. 42. The _______________ axis tells you the loudness and the _______________ axis tells you the frequency. 43. Both the _______________ _______________ and the _______________ change as the sound changes. 44. A _______________ shows how loud sound is at different frequencies over a period of time. 45. A sonogram shows _______________ on the vertical axis and _______________ on the horizontal axis. The _______________ is shown by different colors. 46. We get our sense of hearing from the _______________. 47. The cochlea also gives us our sense of _______________. 48. The _______________ vibrates in response to sound waves in the ear canal. 49. The nerves near the large end of the cochlea respond to ____________ frequency sound while those near the small end respond to _______________ frequencies. 50. People gradually lose the ability to hear _______________ frequency sounds. 51. Listening to loud music can cause the tiny _______________ in your cochlea to weaken or break off. 52. The _______________ of a sound is how high or low we hear the frequency. 53. _______________ is a regular time pattern in a sound. 54. Rhythm can be made with sound and silence, or with different _______________. 55. A combination of pitch and rhythm that we like is called _______________. 56. Music is created from a pattern of frequencies called a _______________ _______________. Each frequency is called a _______________. 57. The range between a _______________ and twice that frequency is called an _______________. 58. _______________ is the study of how sounds work together to create effects, and is based on the _______________ relationships of the musical scale. 59. When two frequencies are close, but not equal, the sounds seem to oscillate or _______________. This is helpful in _______________ a musical instrument. 60. If the combination of sounds is pleasing, it is called _______________. If it is not pleasing, it is called _______________. 61. _______________ _______________ are folds of extendable tissue. 62. The vocal cords extend across a hollow chamber called the _______________. 63. Guitars make sounds by _______________ strings. 64. The guitar is tuned by changing the _______________ of the strings. 65. A guitar with 20 frets and 6 strings can make _______________ different notes. 66. The sound from an _______________ is NOT a single pure frequency. 67. The variation in sound comes from the _______________, frequencies that are multiples of the _______________ note.