Answer the following question given this paragraph: 

The magnitude of the wave function at a particular point in space is proportional to the amplitude of the wave at that point. Many wave functions are complex functions, which is a mathematical term indicating that they contain.


Q: The magnitude of the wave function at a particular point in space is proportional to what property of the wave at that point?

 Choices:

- voltage

- frequency

- Sounding

- amplitude

A:
amplitude
