Which one of the following types electromagnetic radiation causes certain substances to fluoresce a ultraviolet rays b infrared waves c x d cosmic rays?

The correct answer is a. ultraviolet rays

Ultraviolet rays are a type of electromagnetic radiation that can cause certain substances to fluoresce. Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. The light emitted by a fluorescent substance is usually of a longer wavelength than the light that was absorbed.