How does frequency change when wavelength is increased? View Available Hint(s)for Part B Hint 1for Part B. Wavelength, frequency, and wave speed Speed is the product of wavelength and frequency, and the speed of light, which is an electromagnetic wave, is the same for all types of radiations. So if you increase wavelength, what should happen to the frequency to keep their product the same? The frequency increases. The frequency decreases. The frequency stays the same