Question

What is the relationship between the frequency and the pitch
of a sound?

Answer 1

Short Answer: They are directly proportional (as frequency increases, so does pitch).

If you're interested in the nuances of the relationship, check this out:
http://www.physicsclassroom.com/class/sound/Lesson-2/Pitch-and-Frequency

Answer 2

Pitch is associated with the frequency, Greater the frequency greater the pitch