Final answer:
The length of a light wave predominantly determines its color, i.e. longer wavelengths correspond to red and shorter ones to blue/violet. Acuity, brightness, and heat of light are not directly determined by wavelength.
Step-by-step explanation:
The length of a light wave fundamentally determines its color. This is because the wavelength, or length, of the light wave corresponds to a specific color in the visible light spectrum. A light wave with a longer wavelength will be detected by our eyes as a color towards the red end of the spectrum, while a shorter wavelength is perceived as a color towards the blue/violet end of the spectrum. However, the acuity, brightness, and heat are determined by other factors such as amplitude, energy of the photons, and the medium through which the waves pass, not by the wavelength.
Learn more about Light Waves