A guitar player can control the pitch of a string by using the tuning peg to cha

Question

A guitar player can control the pitch of a string by using the tuning peg to change its tension. This works because the ____________ also changes. A. length of the string B. wavelength C. speed of the waves D. All of the above (b) When two waves interfere destructively, the ____________ of the resulting wave is smaller. A. amplitude B. wavelength C. frequency D. speed (c) A pipe that is closed at one end has a fundamental frequency of 100 Hz. Which of the following frequencies is NOT a harmonic of the pipe? A. 300 Hz B. 400 Hz C. 500 Hz D. all are harmonics of the pipe (d) Two sound waves are identical, except that wave A has a smaller amplitude than wave B. Your ears will perceive wave A to be ____________ than wave B. A. quieter B. louder C. lower in pitch D. of different quality (e) To decrease the wavelength of a wave, you can either _____________ its frequency or _____________ the speed of the wave. A. increase ; increase B. decrease ; decrease C. decrease ; increase D. increase ; decrease

Explanation / Answer

1) Length (A) chagens the tune

2) A. Amplitude of distructive interfrence is smaller than the one of teh original ones.

3)Correct harmincs are odd multiples of the fundamental, thus 400 (B) is not an harmonic

4)A quieter. less pressure on the ear

5)By definition l=v/f, thus you have to increase frequency and decrease speed (D)

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