When the wavelength increases then the frequency decrease more wave crests passed at the fixed point per second. Inversely the same will be repeated vice versa.
Step-by-step explanation:
The frequency of a wave is defined as the number of waves that pass a particular point. If a wave is oscillating at a high speed, it is said to have a high frequency. More the number of waves passing a point, the more the frequency.
The wavelength can be defined as the distance between two consecutive crests and troughs. Wavelength is also a significant characteristic of a wave. When the wavelength increases, the frequency decreases. Therefore, they are inversely proportional.