The characteristic of sound by which we can differentiate between shrill and grave sound is _____?

The characteristic of sound by which we can differentiate between shrill and grave sound is _____?

آواز کی وہ خصوصیت جس کے ذریعے ہم شرل اور قبر کی آواز میں فرق کر سکتے ہیں _____ ہے؟
Explanation
Pitch is the characteristic of sound that lets us distinguish between a shrill (high-pitched) sound and a grave (low-pitched) sound.
It depends on the frequency of the sound wave — higher frequency means higher pitch.