Dajabrooks492
26.06.2019 •
Mathematics
Louise is building a guitar-like instrument. it has small metal bars, called frets, positioned across its neck so that it can produce notes of a specific scale on each string. the distance a fret should be placed from the bridge is related to the string’s root note length by the function d(n) = r ( 2^-n/12 ), where r is the length of the root note string and n is the number of notes higher than the string’s root note. louise wants to know where to place frets to produce notes on a 50-cm string. 1. find the distance from the bridge for a fret that produces a note exactly one octave (12 notes) higher than the root note . a . substitute values for r and n in the given function . b . how far from the bridge should the fret be placed? c . what fraction of the string length is the distance of this fret from the bridge?
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Ответ:
a.
b. The fret should be placed 25 cm far from the bridge.
c. So, the fraction of string at which the fret is placed is .
Step-by-step explanation:
We are given,
The function representing the distance of a fret from the bridge by ,
where r = length of the root note string and n = number of notes higher than root note.
Now, Louis want to produce notes on a 50 com string. This gives r = 50.
Thus, .
1. It is required to produce notes which are 1 octave ( 12 notes ) higher than the root note. This gives that n = 12.
So, we get, r = 50 and n = 12 which gives us the function as,
a.
i.e.
i.e.
i.e.
b. Thus, the fret should be placed 25 cm far from the bridge.
Now, as the fret is placed 25 cm far on the string having length 50 cm.
c. So, the fraction of string at which the fret is placed is i.e. .
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