Q: The speed of an electromagnetic wave is the product of its wavelength and what else?


Read this paragraph and choose the correct option from the provided answers:

Electromagnetic waves differ in their wavelengths and frequencies. The higher the frequency of an electromagnetic wave, the greater its energy. The speed of an electromagnetic wave is the product of its wavelength and frequency, so a wave with a shorter wavelength has a higher frequency, and vice versa.

 Choices:

- height

- resonance

- density

- frequency


A:
frequency