Final answer:
The distance between two consecutive crests of a wave is called the wavelength. For a wave with a wavelength of 2 m and a frequency of 5 Hz, its velocity is 10 m/s, which can be found by multiplying the frequency by the wavelength.
Step-by-step explanation:
The characteristic that describes the distance between two consecutive crests of a wave is known as the wavelength. In the context of a wave, the wavelength is the length of one complete wave cycle, which is the distance from one peak to the next. When referring to a wave whose wavelength is 2 m and whose frequency is 5 Hz, the velocity of the wave can be calculated by multiplying the frequency (f) by the wavelength (λ), giving us v = f * λ, which calculates to 10 m/s (2 m * 5 Hz).