Final answer:
The only thing that distinguishes one type of light from another is its wavelength. Different colors of light correspond to different wavelengths.
Step-by-step explanation:
The only thing that makes one type of light different than the other is its wavelength.
Light is a form of electromagnetic radiation, and different colors of light correspond to different wavelengths. For example, blue light has a shorter wavelength than green light.
Frequency and visibility are related to light, but they do not determine the differences between types of light. Additionally, it's important to note that different types of electromagnetic radiation, including visible light, can cause the photoelectric effect, not just visible light alone.