A student is investigating mechanical and electromagnetic waves. She is creating a list of questions to include in her investigation about the properties of each type of wave. Which is NOT a question that she can ask that will allow her to learn about the properties of both mechanical and electromagnetic waves?

A
What is the amplitude of the wave?

B
What is the frequency of the wave?

C
What is the wavelength of the wave?

D
What is the wave speed in a vacuum?