When wavelength decreases, frequency increases.
Wavelength and frequency are inversely proportional to each other in a wave. The wavelength of a wave is the distance between two consecutive peaks or troughs of the wave, while the frequency refers to the number of complete cycles of the wave that occur per unit of time.
The relationship between wavelength (λ) and frequency (f) is defined by the equation:
c = λf
Where 'c' represents the speed of light (in a vacuum) which is approximately 3 x 10^8 meters per second.
According to this equation, if the wavelength (λ) decreases, while the speed of light remains constant, the frequency (f) must increase to maintain the equality. Similarly, if the wavelength increases, the frequency decreases.
In summary, as the wavelength of a wave decreases, the frequency of the wave increases, and vice versa.