Question

For an octave, the eight musical note sound same as which musical note

Answer 1

An octave in music is the interval between one musical note and another note with double its frequency. For example, if you take the note C at a frequency of 261.63 Hz (Middle C), the C one octave higher would be at 523.25 Hz. Thus, the concept of an octave means that the eighth note in a scale sounds the same as the first note but at a higher or lower pitch. In other words, within a single octave, the notes will have the same name, such as C, D, E, F, G, A, B, and then back to C again at a higher frequency.