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18. Pitch is the highness or lowness of sound. Which of the following characteristics of affect the pitch of sound wave?

A. Amplitude
B. Quality
C. Frequency
D. Wavelength

19. Which of the following statements is true about the loudness of sound?

A. Loud sound carries more energy
B. Loudness may vary to some people
C. High intensity sound is usually loud sound
D. All above

20. Which of the following factors affect the pitch of the sound produced by a guitar?

A. The number of vibrations created by Its string
B. The thickness and tightness of its string
C. The person plucking the strings
D. The material of the guitar
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