Answer the following question given this paragraph: 

The variable is the speed of light. For the relationship to hold mathematically, if the speed of light is used in m/s, the wavelength must be in meters and the frequency in Hertz.


Q: The variable is the speed of light. for the relationship to hold mathematically, if the speed of light is used in m/s, the wavelength must be in meters and the frequency in what?

 Choices:

- gigawatts

- miles

- centimeters

- hertz

A:
hertz
