week 9c

# week 9c - Physics 1240 Thurs Today Just a little on...

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Unformatted text preview: Physics 1240 Thurs 3/10/2011 Today: Just a little on Consonance and Dissonance, Begin Stringed Instruments Next time: Stringed instruments, natural modes of vibration, percussion instruments Outline- Quick review of last time - Consonance and dissonance - Natural modes of a string or “standing waves” - Sound radiation from stringed instruments CQ 9.5 According to Pythagoras, the Perfect 4 th interval should be what ratio of higher to lower frequency? A) 2.5 B) (twelfth root of 2) 5 = (2) 5/12 C) 4/3 D) none of the above Need to know… Interval example ratio half steps Major 3 rd C to E 5/4 4 4 th C to F 4/3 5 5 th C to G 3/2 7 Octave C to C’ 2 12 half step = a factor of (2) 1/12 = a factor of 1.05946 whole step = two half steps = a factor of 1.12246 CQ 9.6 Construct the A major scale starting on A=100 Hz. I. Are the letter names of the notes of the first three notes? A) A,B,C B) A,B#,C# C) A, B, C# D) A, C, D Frequency and Pitch Table half step = (2) 1/12 CQ 9.7 Construct the A major scale starting on A=100 Hz. II. What are the frequencies of the first 3 notes A) 100.00, 112.25, 121.21 B) 100.00, 112.25, 122.55 C) 100.00, 105.95, 112.25 D) none of the above, these answers have at least one frequency off by 1% or more. least one frequency off by 1% or more....
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## This note was uploaded on 05/01/2011 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.

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week 9c - Physics 1240 Thurs Today Just a little on...

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