Final answer:
True, we can determine the velocity of a wave using the frequency and wavelength; amplitude is not needed for this calculation.
Step-by-step explanation:
It is true that we can determine the velocity of a wave when given the frequency and the wavelength. The amplitude of the wave, such as the trough amplitude, does not affect the calculation of wave velocity. The relationship between velocity (Vw), frequency (f), and wavelength (λ) is given by Vw = fλ. Therefore, to find the wave velocity, we need the frequency and wavelength of the wave, not the amplitude.
Additionally, the period of the wave (T) can be found from the inverse of the frequency using T = 1/f. The wavelength can also be found if the wave number is known using λ = 2π/k, where k is the wave number. However, neither of these involve the amplitude of the wave directly.