the second most stable interval is... the perfect 5th. the perfect 3rd. the perfect 13th

Answer

Answer:

The perfect 5th.

Brief Explanations:

In music theory, the perfect 5th is a very stable interval after the octave. It has a consonant and harmonious sound, making it one of the most stable intervals. The perfect 3rd is also stable but less so than the perfect 5th, and the perfect 13th is a more complex and less fundamental stable - like interval compared to the perfect 5th.