Question

By a monochromatic wave, we mean ?

Answer 1

In this type of question, we have to state the complete definition of the following thing that is asked in the question and had to explain about it. By stating the correct definition, we can get our answer.

Complete 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 colour. As said in the hint, sunlight is an example of polychromatic light. This is because sunlight consists of different frequencies or wavelengths.

Monochromatic light, or one-color light, is essentially electromagnetic radiation derived from photon emissions from atoms. Photons propagate, or travel, as energy wave fronts of different lengths and levels of energy. Photons propagate, or travel, as energy wave fronts of different lengths and levels of energy. Technologies using monochromatic light have a wide range of applications, from astrophysics and astronomy to forensic science.

A monochromatic light beam is characterized by its brightness or light intensity, direction of propagation, and colour (all visible characteristics) and by its state of polarization (an invisible characteristic). When a monochromatic light is directed to a substance or material, it induces transitions which are characteristic to the chemical properties of the constituent elements of such material. Monochromatic wave means single wavelength.

Note: 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.