Final answer:
In physics, an octave is the interval between one musical pitch and another with double its frequency. The two notes that are not an octave apart are 331 Hz and 622 Hz as provided in Option C, because 622 Hz is not double the frequency of 331 Hz.
Step-by-step explanation:
The student is asking about the concept of octaves in music, which is a concept related to sound frequencies in Physics. An octave is the interval between one musical pitch and another with double its frequency. For example, if we have a note with a frequency of 256 Hz, the note an octave higher would have a frequency of 512 Hz because 512 Hz is exactly double of 256 Hz.
Looking at the options provided by the student, we can analyze which two notes are not an octave apart:
- Option A: 256 Hz and 512 Hz - These two are an octave apart because 512 Hz is double the frequency of 256 Hz.
- Option B: 262 Hz and 524 Hz - These two are also an octave apart because 524 Hz is double the frequency of 262 Hz.
- Option C: 331 Hz and 622 Hz - These two are not an octave apart because 622 Hz is not double the frequency of 331 Hz.
- Option D: 277 Hz and 554 Hz - These two are an octave apart because 554 Hz is double the frequency of 277 Hz.
Therefore, the correct answer is Option C, where 331 Hz and 622 Hz are not an octave apart.