What does the equation C = (upside down Y) f represent?

The equation C = (upside down Y) f is indicative of the relationship between the speed of a wave, its frequency, and its wavelength. In this equation, 'C' represents the wave speed, 'upside down Y' (often represented as λ in physics) stands for wavelength, and 'f' denotes frequency. This fundamental relationship is essential in understanding wave phenomena, particularly in electromagnetic waves, which include light waves.

Electromagnetic waves propagate through space at the speed of light, denoted by 'C'. The frequency indicates how many wave cycles pass a given point in one second, while the wavelength refers to the distance between successive peaks (or troughs) of the wave. This equation essentially confirms that as the frequency increases, the wavelength decreases, maintaining a constant wave speed for that specific type of wave, such as light.

In the context of electromagnetic waves, this relationship underscores the behavior of various types of electromagnetic radiation, from radio waves to gamma rays, all traveling at a consistent speed in a vacuum—therefore embodying the correct choice in this scenario.