Here's why:

* Frequency: The number of sound wave cycles that pass a point in a given amount of time. Higher frequency means more cycles per second, which we perceive as a higher pitch.

* Amplitude: The height of the sound wave, which determines its loudness.

* Wavelength: The distance between two corresponding points on consecutive cycles of a sound wave. While related to frequency, it's not directly the pitch.

Think of it this way:

* Imagine a guitar string vibrating. The faster it vibrates (higher frequency), the higher the pitch of the note you hear.

* The *force* with which the string is plucked determines its loudness (amplitude), not the pitch.

Let me know if you have any other questions!