Which two factors are needed in order to calculate the speed of a wave?
A. frequency and wavelength
B. amplitude and period
C. amplitude and frequency
D. energy and period
"Frequency and wavelength" are the two factors among the choices given in the question that are needed in order to calculate the speed of a wave. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has come to your great help.
