Respuesta :
wavelength increases, because when frequencies are decreased, wavelengths become longer.
Answer:
Wavelength increases.
Explanation:
The Speed of a wave is given by the product of its frequency and wavelength.
i.e ν = fλ, where ν is the wave speed, f is the wave's frequency, and λ is the wavelength.
So for the speed to have a constant value at an instance, then if the frequency decreases, the wavelength will increase and vice versa.