* Speed, Wavelength, and Frequency: These three properties of a wave are fundamentally linked. The relationship is:

* Speed = Wavelength x Frequency

* Decreasing Speed and Wavelength: If both speed and wavelength decrease, to maintain the equation above, the frequency must increase.

Think of it this way:

* Wavelength: Imagine the wavelength as the distance between two crests of a wave. A shorter wavelength means the crests are closer together.

* Speed: If the wave is moving slower, it takes longer for the crests to pass a given point.

* Frequency: Since the crests are closer together (shorter wavelength) and passing slower, more crests will pass a given point in the same amount of time. This means the frequency (number of waves per second) increases.

Example:

* Sound Waves: As the speed of sound decreases (for example, in colder air), the wavelength of the sound wave also decreases. This is why you hear a higher pitch (higher frequency) in colder weather.

Important Note: The relationship between speed, wavelength, and frequency is specific to a given medium. The speed of a wave can change as it moves from one medium to another (like from air to water), but the frequency of the wave remains constant.