Is monochromatic light is a ultra violet light?

Answer 1

Monochromatic light is light of one wavelength. E.g. A red laser has one single wavelength and is therefore categorised as 'monochromatic light'. A standard light bulb emits light of many different wavelengths across the visible spectrum and therefore is not 'monochromatic light'.

Answer 2

Monochromatic light refers to light of a single wavelength or color. Ultraviolet light is a different category of light that falls outside the visible spectrum, with a shorter wavelength than violet light. So, monochromatic light can be any color, not specifically ultraviolet.