When changing the color from green to violet, the number of waves will remain the same.
The color of light is determined by its wavelength, which is the distance between two consecutive peaks or troughs of the wave. Red light has the longest wavelength, while violet light has the shortest wavelength. However, regardless of the color of the light, all electromagnetic waves travel at the speed of light and have the same frequency.
Frequency refers to the number of waves that pass a given point in a second, and is measured in hertz (Hz). Therefore, when the color of light is changed from green to violet, the wavelength will become shorter, but the frequency (and thus the number of waves) will remain the same.
So, the answer is C) remain the same.