Question

Light of one single color is called
(A) Monochromatic
(B) Multichromatic
(C) Dichromatic
(D) Polychromatic

Answer 1

Hint : Usually, the light we see around us exists with multiple wavelengths or frequencies. Monochromatic light is light that has only one wavelength or frequency. Sunlight has multiple frequencies or wavelengths of light in them so they are called polychromatic light.

Complete step by step answer
Monochromatic light is light that has one single wavelength or frequency in the electromagnetic spectrum of radiation. This type of light in the visible region of electromagnetic radiation will exhibit only one color. As said in the hint, sunlight is an example of polychromatic light. This is because sunlight consists of different frequencies or wavelengths.
In the given options, every option except option (A) has a definition that associates more than one wavelength or frequency of light. So we can conclude that all the other options are not true in this question.
So, option (A) is the correct option.

Additional Information
Solar radiation consists of all radiations- gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves. But the radiation that reaches the earth has a wavelength ranging from $100nm$ to $1mm$ that includes ultraviolet radiation, visible radiation, and infrared radiation.

Note
You can easily conclude the answer from the given options. The word chroma means color in Greek and the word mono means one or single in Greek. So together, it means single-colored. In Greek, the word poly means multiple, and the words bi means two, tri means three, and so on. So we can easily make out that the second, third, and fourth options are related to more than one colored light.