Answer:
The answer is D.
Explanation:
The musical interval between two notes depends on the ratio of their frequencies. An octave is a ratio of 2:1, an octave comprises 12 equal semitones. Each semitone therefore has a ratio of:
[tex]2^{\frac{1}{12} }[/tex]≈ 1.059
Then by convention, A4 is often set at 440 Hz and has MIDI note 69.
MIDI note 68 wich is one semitone below A4, that is, G#:
G#= [tex]\frac{440}{1.059}[/tex]=415.3 Hz
MIDI note 67 wich is one semitone below G#, that is, G:
G= [tex]\frac{415.3 }{1.059}[/tex]=392 Hz
MIDI note 66 wich is one semitone below G, that is, F#:
F#= [tex]\frac{392 }{1.059}[/tex]=369.9 Hz
MIDI note 65 wich is one semitone below F#, that is, F:
F= [tex]\frac{369.9 }{1.059}[/tex]=349.23 Hz
MIDI note 64 wich is one semitone below F, that is, E:
E= [tex]\frac{349.23 }{1.059}[/tex]=329.63 Hz
MIDI note 63 wich is one semitone below E, that is, D#:
D#= [tex]\frac{329.63 }{1.059}[/tex]=311.13 Hz
Therefore MIDI note 62 wich is one semitone below D#, that is,D:
D= [tex]\frac{311.13 }{1.059}[/tex]=293.6 Hz
