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Musical

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Review String – = 2L –Frequency of overtones 1 st : 2 × fundamental frequency 2 nd : 3 × fundamental frequency 3 rd : 4 × fundamental frequency Pipe open or closed on both ends – = 2L –Frequency of overtones 1 st : 2 × fundamental frequency 2 nd : 3 × fundamental frequency 3 rd : 4 × fundamental frequency

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Review Pipe open on one end and closed on one end – = 4L –Frequency of overtones 1 st : 3 × fundamental frequency 2 nd : 5 × fundamental frequency 3 rd : 7 × fundamental frequency

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Harmonics The fundamental and overtones can be described with other terminology -- harmonics –Fundamental1 st harmonic –1 st overtone2 nd harmonic –2 nd overtone3 rd harmonic

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Whats the difference between a piano and a fish? –You can tune a piano, but you cant tuna fish. What do you call a fish with no eyes? –Fsh

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Tune Due to constructive and destructive interference, waves that are at similar frequencies (within about 7 Hz of each other) will cause a phenomenon known as beats. The resulting sound wave will get louder and softer at a frequency equal to the difference in the two wave frequencies

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Strike a chord Some notes played together sound good –Others do not Notes that go well together have a special ratio of frequencies –An octave is a ratio of 1:2 (or 2) –A third is 4:5 –A fourth is 3:4 –A fifth is 2:3 –C, E, G have a ratio of 4:5:6

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Practice p. 426-427 75-79, 83

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Music, Superposition and Chords Physics 11Adv. Comprehension Check 1. What beat frequency would you expect if two trumpets play the same note but one.

Music, Superposition and Chords Physics 11Adv. Comprehension Check 1. What beat frequency would you expect if two trumpets play the same note but one.

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