Final answer:
The wave with a frequency of 900 Hz and a wavelength of 200 m is traveling at a speed of 180,000 m/s, calculated using the wave speed formula, which multiplies frequency by wavelength.
Step-by-step explanation:
The speed at which a wave travels can be calculated using the formula: wave speed (v) = frequency (f) × wavelength (λ). Given a wave with a frequency of 900 Hz and a wavelength of 200 m, the wave speed can be computed as follows:
v = f × λ = 900 Hz × 200 m = 180,000 m/s.
Therefore, the wave is traveling at a speed of 180,000 meters per second (m/s).