Final answer:
The wavelength of a wave increases with a lower frequency.
Step-by-step explanation:
The wavelength of a wave increases with a lower frequency. As the frequency decreases, the wavelength increases proportionally. This can be seen in various wave phenomena, such as sound waves and light waves. For example, in the case of sound waves, when a source of sound moves away from an observer, the wavelength increases and the frequency decreases, resulting in a lower pitch of sound heard by the observer.