According to the pitch helix, notes that are exactly one octave apart:
A) have the same fundamental frequency.
B) have the same tone chroma.
C) have a different tone chroma.
D) are aligned horizontally.

Question

Quizplus · Accepted Answer

Notes that are exactly one octave apart share the same tone chroma, which refers to their perceived similarity in sound despite the difference in pitch. This is why they are often considered equivalent in many musical contexts.

According to the Pitch Helix, Notes That Are Exactly One