Question

A pure tone is a sound produced by: A) a sinusoidal sound wave of a frequency B) the sum of sine waves of various frequencies C) a square sound wave D) a single note on a musical instrument The string of a guitar vibrates noticeably when the waves that go up and down the string: A) are added B) produce vibrations in the string C) produce vibrations under resonance conditions Resonance in a guitar string occurs when waves going in the same direction are: A) Large B) in phase C) out of phase If "L" is the length of the string and "Î»" is the length of the waves that go up and down the string, there is vibration in resonance when: (Ne are whole numbers, Nimp are odd numbers). A) Ne * (Î» / 2) = L B) Î» = L C) Nimp * (Î» / 4) = L D) Î» = L / 2 The frequencies of vibration of the string at resonance are the fundamental f0 and the harmonics fn. The fundamental is the easiest to provoke and is known as the natural frequency of vibration of the string. The f0 = (T / Î¼)^(1/2) / 2L and the others are the harmonics: A) Ne * f0 (Ne > 2) B) an infinite continuity of others C) relatively few more D) Nimp * f0 (Nimp > 3) Generally, when playing the string, the fundamental vibration is caused mainly, but also a little of several others (among the harmonics). Now, the transfer of energy from the string that is vibrating to the air (to produce sound waves) is best achieved if the air is in a situation (partially trapped) so that it can also vibrate in resonance in one or more of the frequencies at which the string vibrates. This is achieved, at different levels of energy transmission for different frequencies of the string, in the soundboard of the guitar. Thus, the frequencies with which the string vibrates (fundamental and some harmonics) start to make the air vibrate more easily in the resonance box, although at different degrees of intensity. Finally, the air that vibrates in the guitar body, together with the vibrating string, generates the sound waves in the open air that reach our ears so that we hear the complex and particular sound of playing a string on the guitar. Therefore, the sound of a note of the string played on the guitar is ____________________ in quantity (s) that depend on how the string was played and how there was resonance in the body. A) a wave of sounds of one frequency B) the sum of sine waves of various frequencies C) the sum of sine waves of various fundamental frequencies D) the sum of sine waves of various frequencies (fundamental and harmonic)

          A pure tone is a sound produced by:
A) a sinusoidal sound wave of a frequency
B) the sum of sine waves of various frequencies
C) a square sound wave
D) a single note on a musical instrument

The string of a guitar vibrates noticeably when the waves that go up and down the string:
A) are added
B) produce vibrations in the string
C) produce vibrations under resonance conditions

Resonance in a guitar string occurs when waves going in the same direction are:
A) Large
B) in phase
C) out of phase

If "L" is the length of the string and "Î»" is the length of the waves that go up and down the string, there is vibration in resonance when: (Ne are whole numbers, Nimp are odd numbers).
A) Ne * (Î» / 2) = L
B) Î» = L
C) Nimp * (Î» / 4) = L
D) Î» = L / 2

The frequencies of vibration of the string at resonance are the fundamental f0 and the harmonics fn. The fundamental is the easiest to provoke and is known as the natural frequency of vibration of the string. The f0 = (T / Î¼)^(1/2) / 2L and the others are the harmonics:
A) Ne * f0 (Ne > 2)
B) an infinite continuity of others
C) relatively few more
D) Nimp * f0 (Nimp > 3)

Generally, when playing the string, the fundamental vibration is caused mainly, but also a little of several others (among the harmonics). Now, the transfer of energy from the string that is vibrating to the air (to produce sound waves) is best achieved if the air is in a situation (partially trapped) so that it can also vibrate in resonance in one or more of the frequencies at which the string vibrates. This is achieved, at different levels of energy transmission for different frequencies of the string, in the soundboard of the guitar. Thus, the frequencies with which the string vibrates (fundamental and some harmonics) start to make the air vibrate more easily in the resonance box, although at different degrees of intensity. Finally, the air that vibrates in the guitar body, together with the vibrating string, generates the sound waves in the open air that reach our ears so that we hear the complex and particular sound of playing a string on the guitar. Therefore, the sound of a note of the string played on the guitar is ____________________ in quantity (s) that depend on how the string was played and how there was resonance in the body.
A) a wave of sounds of one frequency
B) the sum of sine waves of various frequencies
C) the sum of sine waves of various fundamental frequencies
D) the sum of sine waves of various frequencies (fundamental and harmonic)

Added by Jordi C.

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