Given the question: Answer the following question given this paragraph: Green light has a higher frequency than microwaves. It is possible to calculate it, but since the speed of an electromagnetic wave is constant we know that waves with higher wavelengths must have a lower frequency based on the wave equation. Q: What of a electromagnetic wave can be calculated using the wave equation due to their speed always being constant? Choices: - oscillation - resonance - sound - frequency A:
The answer is:
frequency