(a) A guitar player can control the pitch of a string by using the tuning peg to
ID: 1497060 • Letter: #
Question
(a) 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
(a) f = v/lamda = v/2L
correct option is (D)
(b) correct option is (A)
(c) f =100 Hz
in closed pipe only odd harmonics are possible
correct option is (B)
(d) Correct option is (C)
(e) v = f*lamda
Correct option is (D)
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