Answer:
She passes through a loud spot at x = 19.5m from the first speaker. Constructive interference occurs here.
At the quiet spot destructive interference occurs. The minimum distance for this to occur is 20.25 from the first speaker.
Explanation:
L l Aigabeera ya q alr mma grasvdade l aferza uatare ms al amtaeialr lgerio hcaieno q edse pese masth
30 grams of radioactive isotope have passed.