If the frequency increases, the wavelength _________.

The correct answer is: Decrease

• The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
• $c=f\cdot \lambda$ $(\text{The speed of light is directly proportional to}$ $f$ and $\lambda )$.
• $\frac{\mathrm{c/}}{\lambda }=f$ $(\text{The speed of light is directly proportional to}$ $\lambda$, and $\lambda$ is inversely proportional to $f$.