Answer:
-They have the same frequency
-They have the same period.
Step-by-step explanation:
The vibration of the guitar string will result in the sound wave. Then, they will have the same frequency because the first one produces the second one. If they have the same frequency, they also have the same period because frequency and period are reciprocal. Then, the answers are
-They have the same frequency
-They have the same period.