as frequency increase, wavelength ______________ as wavelength decreases, frequency ______________

Brief Explanations:

The relationship between frequency ($f$) and wavelength ($\lambda$) is given by the formula $c = f\lambda$, where $c$ is the speed of light (a constant in a given medium). Since $c$ is constant, when $f$ increases, $\lambda$ must decrease to keep the product constant, and vice - versa.

Answer:

As frequency increases, wavelength decreases. As wavelength decreases, frequency increases.