Here's why:

* Frequency is the number of wave cycles passing a point in a given time. Think of it as how many times a wave "wiggles" per second.

* Wavelength is the distance between two corresponding points on successive waves (e.g., the distance between two crests).

The relationship between frequency and wavelength is inversely proportional. This means that as one increases, the other decreases.

Think of it like this: if you have a fixed amount of rope and make waves with it, the more frequently you wiggle the rope, the shorter the distance between the waves will be.

This relationship is described by the following equation:

Speed of the wave = Frequency x Wavelength

Since the speed of a wave in a given medium is constant, if frequency increases, wavelength must decrease to maintain the equation.